Cheating???

Cynthia
Okay so I've been with my boyfriend for a year and a half, I love him to death. He just turned 21 and he's been drinking a lot. Whenever he drinks and I'm not around, he's ALWAYS talking to other females and trying to get with them WHILE HE IS STILL TALKING TO ME. they all reject him but, it's seriously breaking my heart and I don't know what to do, I try to confront him but he always turns it against me like it's my fault and he says he doesn't care. He claims he loves me but I just don't believe it anymore.