I don't understand this guy at all... Can someone help?

Hey, so I’m 19, and I kind of have this thing for this guy, who’s called Q. I only learned his real name a while ago because EVERYONE calls him Q. He’s 22, and he’s the funniest person I’ve ever met, hands down. We only started hanging out just the two of us maybe two weeks ago. We met maybe two months ago. He works at the movie theater that everyone around here goes to, and is sort-of friends with my friend Jim, who also works there. So we had hung out a few times in a group of five people or so. He seemed a little mean and he has a very harsh kind of personality but he’s hysterical. He’ll do anything to get a laugh, even if he looks like a fool. I say he has a harsh personality because he’s very sarcastic and sensitive people could think he’s mean. I know his sense of humor though, and he’s nicer to me than anybody else.

He’s far from what I usually am attracted to, considering I am bisexual and usually am attracted to girls, and he’s nothing like the very few guys I find attractive, but I like him. Two weeks ago, I was going to the movies with my friend Ashley and she bailed on me once I got to the movie theater, where Q was clocking out. The theater is connected to a mall, and I saw him getting lunch and went over and talked to him. I think I surprised him and he seemed almost annoyed at first by my presence because I’m very bubbly and loud and he’s really calm and sort of introverted. But after talking to him for maybe ten minutes while he ate, he asked me if I wanted to hang out with him at the mall for a while, and I said yes. We ended up staying there until it closed, and we sat in his car for two hours and got into this really deep conversation where he told me that he’s dealt with a lot of sh*t in his life, which is why he has such a hard outer shell, and he doesn’t really share any of his feelings with anyone because it would break his hard shell. He told me that in high school, he didn’t really have friends and girls didn’t have any interest in him, and no one would really accept him, so he kept to himself. I could just tell he’s been through a lot, and he’s been hurt, and that there’s a lot more to him than what I’ve seen.

Since then, we’ve been hanging out a lot. Every time, he acts almost annoyed with me for the first twenty minutes or so, and makes a lot of sarcastic remarks and otherwise stays pretty quiet, which I just laugh off, and then after that, he becomes totally different. He warms up to me and he’s nothing but sweet and attentive, and he just makes me feel completely safe and happy. I really like him, but I don’t understand him at all. I’ve never had a difficult time understanding guys, but he’s a complete mystery to me. I think he likes me because he treats me differently from anybody else, and he’s nothing but patient and nice to me, and is sarcastic and kind of harsh with everyone else, but I could be wrong. I don’t understand why the first twenty or so minutes, he acts annoyed, and then all of a sudden he does a complete turnaround and he’s the nicest guy I’ve ever met. And I don’t understand what he said about not being accepted by people. There’s nothing wrong with him except his hard exterior. He’s not weird looking, he always smells great and dresses normally, and he’s so funny. He constantly has me laughing so hard that I’m in tears. I just don’t get it. Can someone help me? Do you think he likes me? Why does he act the way he does around me? And what do you think he meant about not being accepted and not having friends? Thank you so much.