Is this a valid reason to leave my bf?

[DocOK]

This is classic gaslighting behaviour: a form of psychological manipulation aimed at convincing another person into doubting her own reality. You asked, quite reasonably imho, why he was behaving badly towards you. Instead of explaining himself, he accused YOU of behaving badly towards HIM. There are better people out there to have a relationship with; you don't need to stick with one like this. If he asks why, you can fudge it with an excuse or tell him the truth - choose the option which gives you the least hassle. Don't just continue to put up with his behaviour in the hope that it will all come out fine; it never does.