Justin Bieber & Selena Gomez

Selena Gomez continues to torture Justin Bieber ... that is if you believe her song lyrics are a reflection of real life ... because her new track is about a on-again-off-again relationship she just can't shake. Sound familiar?

As TMZ previously reported ... sources close to JB are adamant he's acting out from heartache over his split with SG -- claiming SHE won't make a clean break and the two are still very much in contact.

So when SG's song "Come & Get It" was released online Saturday -- riddled with lyrics about an addictive love that's not quite over -- it begged the question, is it about JB?

Here are some gems from the song:

You ain’t gotta worry it’s an open invitation
I’ll be sittin’ right here real patient
Can’t stop because I love it, hate the way I love you.
All day all night maybe I’m addicted for life, no lie.

This love ain’t finished yet ...
So baby whenever you’re ready… come and get it.

Ending with ... This love will be the death of me.

Justin Bieber has been spinning out of control not because he's trying to "act like an adult," not because his friends are a bad influence ... but because he's suffering his first case of heartbreak -- courtesy of Selena Gomez -- so say people who are in regular contact with the singer.

Our sources tell us ... Justin was "torn apart" when Selena pulled the plug on their relationship in December, when she walked out on him in the middle of their Mexico vacation.

We're told Justin feels "tortured," because Selena has not made a clean break -- far from it. We're told she is regularly calling him and sending him mixed messages, and it's been messing with his head.

That could explain why Justin went to Selena's L.A. home last week, but hasn't been seen there since.

Our sources say ... the pot smoking in Newport Beach, the reckless driving and the fighting has all occurred after the split, and they say it's very clear that Bieber is holding a lot of anger that he's releasing ... often inappropriately.

When Justin Bieber's in trouble -- and he's in a ton of it right now -- his go-to person is still ex-girlfriend Selena Gomez ... cause he paid her a quick visit Wednesday afternoon.

Justin's chauffeur-driven party van was spotted parked behind the gates of Selena's driveway for more than an hour. The exes reportedly left her home separately.

Selena's home isn't too far from Bieber's Calabasas house ... where a neighbor says Justin spit on him during an argument.

As we first reported ... the neighbor has filed a battery report against Bieber and wants to see him prosecuted for the incident.

Hmm ... wonder what Justin and Selena talked about?

Selena Gomez just appeared in a video dancing to the song "Everybody Knows (Your Boyfriend is a Douchebag)" ... which begs the obvious question ... is this a message directed at her ex-BF Justin Bieber?

Selena and her friends post videos like this all the time -- dancing to other people's songs -- but the timing of this one seems suspect, considering Bieber's recent wave of d-baggery.

It's possible Selena and her friends just like the tune ... and there's no hidden meaning ... but Justin and Selena have been known to communicate through song.

You'll recall JB sang "Cry Me a River" at a concert after they broke up. Selena later responded by performing the same song.

So we gotta ask ...

If Selena Gomez was trying to find a way to make Justin Bieber REGRET breaking up ... this hot red outfit will probably do the trick.

Gomez -- and her butt cheeks -- were hanging out in Palmdale, CA this week ... where word on the street is that she was shooting a new music video.

Muy bien.

Time to fire up the Justin Bieber/Selena Gomez rumor mill ... because Selena was spotted returning home yesterday after hanging out allllll night with the Biebs.

The on-again/off-again (to the infinity power) couple hasn't actually been seen together in some time ... and we're told this is the first time the two have seen each other in a month.

It's clear these two young lovebirds just don't know how to quit each other.

Justin Bieber isn't the only one who can belt out Justin Timberlake's classic "Cry Me a River" ... turns out his currently ex-girlfriend, Selena Gomez, has a version of her own up her sleeve.

You may remember ... back in November, after one of their numerous splits, Justin performed the JT track on stage in Boston.

Last night in New York, it was Selena's turn ... doing her own rendition at a show for UNICEF in NYC.

So we gotta ask ...

Selena Gomez had nothing to say at LAX about her breakup with Justin Bieber or allegations that the Biebs had been smoking pot.

TMZ broke the story ... Selena and Justin broke up in Mexico on December 30th after a blowout argument. She flew back to L.A. that day and Justin returned on New Year's Eve. As for the nature of the argument, a source tells us, "It's just high school stuff."

The photogs were trying to grill Gomez -- who dressed like a chic Unabomber -- about Justin's alleged marijuana use. A close friend of Chris Guerra -- the photog who was killed on New Year's Day -- told TMZ Guerra had told him he saw J.B. driving his Ferrari earlier in the day, smoking pot from a pipe. Sources connected with Bieber insist it's not the case.

Sources close to the singer tell us ... Selena has been suffering from a sore throat lately ... and this morning she thought she might have strep, so she decided seek immediate medical attention.

We're told Selena had been suffering from symptoms yesterday ... and had to end a recording session early due to the pain.

Also, Selena's stepfather has been suffering from bronchitis, and she thinks she may have been exposed to something contagious.

But sources tell us ... so far, docs don't believe Selena has strep ... though the tests won't come back for a couple of days.

Trying to keep up with the status of the relationship between Justin Bieber and Selena Gomez is proving to be maddening -- as the on-again/off-again (repeat 7x) couple was on again last night after the American Music Awards.

Bieber and Gomez didn't show up to the AMAs together, but they did walk hand-in-hand into Bootsy Bellows nightclub in West Hollywood for an AMA after-party.

As TMZ first reported, Gomez's main beef with Bieber is the fact he tends to hang around A LOT of supermodels. Our sources say Biebs is starting to think they're better off as friends.

But if he is trying to win her back, Jenny McCarthy did him no favors last night by practically molesting him on stage after handing him an award.

UPDATE: As of 1:00 AM. Justin Bieber and Selena Gomez are single, and Justin now thinks it may all be for the best.

Feelings: As of 1:00 AM, Selena wants to right the relationship and get back to boyfriend/girlfriend status. Justin is now telling his close friends he's on the fence, partly because Selena has been so erratic. You'll recall, Friday night she stormed out of a restaurant they were eating at and wouldn't open the gate to her home to let him in.

Justin thinks they may be better off as friends ... unclear if there's a benefits package.

SOURCE OF FRICTION: Supermodels (see photo below).

STATUS LATER TODAY: Anyone's guess.

You're a 20-year-old female pop star and you've just broken up with a famous fella ... who better to understand what you're going through better than the Queen of Breakups ... Taylor Swift.

Yes, Selena Gomez shared a meal in L.A. last night with the woman who has famously been linked and then unlinked with the likes of Joe Jonas, Taylor Lautner, John Mayer, Cory Monteith, Toby Hemingway, Jake Gyllenhaal, Zac Efron, Garrett Hedlund, Eddie Redmayne, Harry Styles and Conor Kennedy.

Just hours after the two had a nuclear fight, Justin Bieber's white Ferrari was seen pulling out of Selena Gomez's home early Saturday morning.

As TMZ first reported, the on-again/off-again couple went out to dinner Friday night, but left after just 10 minutes. The two then drove separately back to Selena's place (Justin was a few minutes behind) but she denied him at the gate.

Justin Bieber and Selena Gomez got in an epic argument during dinner Friday and let's just say ... they didn't even make it to the appetizer.

A source inside the San Fernando Valley Japanese restaurant tells TMZ ... the "couple" had an argument while inside the restaurant and Selena left less than 10 minutes into the meal. Justin quickly followed with his head bowed.

According to a photog on scene ... Selena drove home with Justin trailing a few minutes behind. When Justin got to her place ... she denied him entrance at the gate and Bieber drove off.

As quickly as Selena Gomez blocked Justin Bieber from her life via her telephone and whatnot, they hooked up again ... capping off a 24-hour rendezvous at a swanky Beverly Hills hotel.

TMZ has learned ... Bieber had a driver take him to LAX Wednesday night, where they picked up Selena ... and rolled over to her home. We're told Bieber spent the night at SG's place.

The next morning, the two hitched a ride to the Four Seasons Hotel in Beverly Hills ... but entered the building at separate times, presumably so no one would snap a shot of them together.

Selena Gomez spent the last day blocking her phone numbers and other communication devices so Justin Bieber cannot contact her ... TMZ has learned.

Sources familiar with the situation tell TMZ ... Selena wants no contact with Justin, so whatever they tried hashing out during their sit-down last Sunday didn't work. She has blocked her phone (which includes texting). For some reason, she's still following Justin on Twitter, but we're told she's blocked him on all forms of contact.

And ... we've learned ... the breakup absolutely, positively involved another woman -- though our sources didn't know which one. There's been speculation that it's a Victoria's Secret model. We don't know for sure if it's her, but we know it involves another woman.