<human>: Could you distill the essence of the text into 1-3 sentences?

Maybe you guy can help me out here. I'm 20 in 3 months if it helps.

For the past year, I've been very single. I've had plenty of hook ups, and have met A TON of girls, to the point where people ask me how I know so many. Numbers are no problem for me, I've been told many times I'm attractive, and people seem to have a good time around me. I've even got a rep of being a flirt around campus.
I started this thing with a girl I've had a crush on for about a year in September. She had a boyfriend for the longest time, and when she was single, I jumped on it and was able to get her. I didn't want a relationship though, so we both agreed on nothing serious.

Strange thing is.. things got more serious after that. We started going out on dates more and going further sexually, to the point where we had sex (just last friday actually.)

When we're together, we have a GREAT time. We laugh, joke, get along great in the bedroom. Everything we do together indicates she likes me a lot. When we're not together, she tells me she misses me and wishes she could see me. But here's the thing: We don't hang out very often. Maybe once a week, if that. Part of that comes from us both having a lot of classes, but she's also hard to pin down. She drives to see some of her friends for weekends at a time, not telling me till Thursday or Friday when I've told her I'd like to see her that weekend. I'll text her asking her about her day, and I won't get a reply.
For some reason, I feel very clingy, but I'm not being clingy. I only ever text her once, then leave her alone. If she can't hang, its no big deal (I told her I was a bit annoyed once). How do I get out of my head on this one? Half of me is sure she likes me, her actions say so, but half of me doesn't believe that, cause her actions say she doesn't.

thanks for reading!
<bot>: Girl acts like she likes really me when she's with me, and says she wants to be with me, but isn't with me very often. Confused.