I can't anderstand him any more !!!!?

I love a guy & he loves me but we didnt tell each other, he always try to talk to me and stand next to me, he asked me out last year, i thought it was going to fast, so we didnt go, but after that we were cool, then i heard that he loves other girl, i saw him talking to her and she is smilling ( I think that he was trying to get my attincion), ididnt give him any, and i tired to forget him, now he i think he's trying to get back becoz he called me without a reson and came to talk to me and he's starting to do the things i like, and the girl he didnt talk to her any more, just the nesscery things, so what is he thinking? , and what should ido now?