im going through the same thing right now but if hes cheating on his girlfriend with you then he probably cheated on you with her, so maybe hes not worth loving, it sounds to me like hes using you both for sex... but i could be really wrong, is he still with that girl???...how long did you guys date? i dated my girlfriend for 2 years and i broke up with her because i was jealous that she wanted to spend time with someone over me, but i realized how much of a mistake i made and she wont take me back now, maybe she thinks ill still be jealous but i believe im a changed person, but right now were friends with benefits and she says she loves me but she wont be my girlfriend, she says its the distance we have between us we live an hour apart and shes worried we wouldnt make it in the future because of this mishap.....i hope i could help, because i know its hard trying to get over someone you love more than anything especially when you continue to have sex and talk and see them