This keep happening to me...

I'm in college, I'll often meet a girl at a bar or at a house party and do real well with talking to her and stuff. Usually I'll get her number then invite her to a party or meet up with her downtown the next weekend and take her home. Then I will more or less be trapped in that cycle forever - not talk during the week much, then the weekend comes I will shoot her a text asking if she is going whatever party or bar I am going to, then hooking up, then not really talking much until the next weekend. After a while, I start to like the girl but am denied for non-weekend/non-drinking invitations be it go get dinner somewhere or to come over and chill.

Usually at this point I get pissed off and the next time I've had a few I go on a drunken text binge and destroy the set up I had, then wash, rinse, repeat.

It's nice to be able to get with girls as often as I do and am pretty much the only guy among my friends who consistently gets with girls outside of our immediate social group - but I can't figure out what the fuck is wrong with me where I keep getting denied when I try to make things more serious. I am almost perpetually in the state of sometimes hooking up with a girl - but haven't been in a real relationship in all of college.

What is going on?