<human>: Give me a shortened version of the text

So, I like this girl. I would see her at parties every now and then and we'd kiss. I had her number, but we were both too busy at the time to get together. Three months later, we don't really know what's what. she tells me she wants to have more contact when she's drunk and I decide I want to pursue whatever it is we're having. I try to ask her out a few times, but she never has time. Obviously, this annoys me.

She invited me to a New Year's dinner her sorority was having. We have some really shitty conversations and she tells me she doesn't really want a relationship, since she just started college and doesn't want to be pinned down. We agree to just see what would happen that evening that evening. 

Now, for some reason I'm a really paranoid person. I always think people don't like me or are making plans to fuck me over behind my back, I don't even know why. Over the course of the evening, I get drunk and for some reason begin to think she doesn't like me. This is empowered by my friend, who had been talking to her too and tells me she isn't into me. I don't remember the exact wording, but that was the gist of it.

Fast forward a few hours, I've been talking to a friend of hes. The group goes to a club and well I guess you can see where this is going. I kiss her girlfriend in a drunken stupor, thinking girl 1 won't ever like me and then shit hits the fan.

Well, I fucking hate myself now. Rightfully so, probably. Just needed to get this off my chest I guess.
<bot>: I kissed the girlfriend of the girl I had been seeing on and off and liked because I thought she wasn't into me. Now their friendship is fucked and the girl I liked doesn't like me anymore.