My (kind-of) best friend seems like he is using of me. Idk if im just paranid or if hes really an ***hole?

Yea man. I'd definitely try to meet some SINGLE people. It's no fun being the 6th toe. Not saying get rid of your buddy just ask him to leave his chick at home sometimes or have his kissy face time with her in private. You don't want to be around that. You can politely let your friend know he should find some couples to hang and drink with for a night and you go out and chill with some single people. Nothing wrong with that.