Big Sean & Ariana Grande Split -- Sorry Biebs ... Nothin' To Do With You

Justin Bieber is no homewrecker ... at least in this case ... because TMZ has learned that Big Sean and Ariana Grande's split has nothing to do with his mid-concert groping.

Sean and Ariana are history after 8-months of banging, and sources close to the couple say it had nothing to do with Sean's real/fake Twitter outburst after Biebs laid hands on his woman during her show a few weeks back.

We're told the breakup was mutual because they're both constantly touring and just think it's better this way -- but they're staying tight as friends.

Now Biebs can REALLY make a move ... Kendall Jenner probably won't mind.