love or let go?

Tori
So there's this guy I really like.... I think I'm falling in love with him but he has had a bad past and not the best reputation. He's known for sleeping around. But when I broke up with my ex, we started hanging out more. I helped him move into his apartment and everything. We basically spent a whole week together acting like a couple. Kissing, sleeping together, asking me how my day was or stopped in to see me at work. He's so sweet but he's going through a lot right now. Basically everyone has turned their back on him. But he doesn't make any effort to talk to me and now he's supposedly with this other girl. So should I love him? Or let him go?
Like I don't even understand what he means by "everyone except you and me"?!? Help me...