I like my guy friend, does he like me? Or should I move on?

I am really good friends with this one guy, but I have had a crush on him since forever. I am 99% sure he doesn't know that I like him though. Recently, he started acting *slightly* different around me. Just small things, like adding kind of flirty lines when we talk or are texting, he texts me more, we talk more about things like dating. Also, he says things like "we should go to the movies together." Also, sometimes I turn around an he is just kind of looking at me, and then I say "what?" and he kind of goes "uh, I don't know" a little bit embarrassed. There are lots of other little things he says or does that just make me think "maybe?" like when he said "I miss you" when I was on vacation. But I am biased because I like him, and although my friends say things like "oh I think he likes you" or "he keeps staring at you" he said one thing that made me think even if he did like me, nothing could happen. Once I was talking to him about things like dating (I've never dated anyone, he has) and he said he would never date a girl he was friends with because it causes "too much turmoil." He said this because his last girlfriend was his friend before, and his relationship didn't go anywhere, plus her best friend got mad at her because she asked him out and he said no, then he asked her out. So I thought, even if he likes me, he wouldn't date me. So should I *try* and move on (I have tried before, so not working, if so, any tips?)? Or wait? Or any other suggestions?