Mac Miller's New Song 'Self Care' Is Not About Ariana Grande

Mac Miller's new song is seemingly about relationship troubles, but it has nothing to do with his split with Ariana Grande ... TMZ has learned.

Mac dropped "Self Care" Friday ... a single with lyrics that include, "Well, didn't know what I was missing. Now I see a lil' different. We play it cool. We know we f***ed up, yeah. You keep on sayin' you in love, so? Tell me are you really down?"

Fans and reports were quick to connect the lyrics to Mac's split with Ariana a couple months ago. However, our sources say Mac wrote, produced and completed the track last year.

As we've reported -- Ariana is engaged to SNL comedian Pete Davidson -- the two even went in on a massive NYC condo together.