Search Results: how can i break up nicely

I recently met this guy end of April.
Honestly I haven't ever been so infatuated with anyone before. I.. Messed things up.. before we started.. And things haven't been the same between us since. In the beginning he kept saying he doesn't know how he got so lucky with meeting me, how gorgeous I am, he gave me a lot of time, etc.. And then I went possessive crazy on him when things were going fine. I knew he was broken badly from a previous relationship and just needed to go slow and he told me it wouldn't be "serious" right away bc he can't do that & he doesn't want to deal with the full commitments of a relationship now bc he can't. Then I just freaked on him when he was talking to another girl.

I'm just so... BLEH. Honestly I have never felt so much magic with anyone as I had with him.. Sleeping over at his house for one weekend now feels like a long lost dream. I just can't stand to think that I'm just one of 3/4 others that he is casually seeing (he says he rarely lets anyone sleep over) or if he's open to meeting others while sleeping with and seeing me. We do things outside of sex, he treats me nicely.. But he isn't giving me all his time and the effort is not equal.
Looks wise, I don't think he can do better. I'm not trying to sound cocky here, really I just mean based on the other women I've seen he talks with, & he has told me this, I'm "too good, what do I see in him?"
I'm also 21 and he's 28. I don't know, I know he likes me somewhat and i really am a good genuine person. if he isn't allowing me in, then what do I do? Am I taking this too seriously? If I just went casual on him and let him do his thing, if he likes me will he come around or is that just wishful thinking?