confused about boy i like's behavior....... help?!?

i like this guy in the class below me. and he admitted to me that he likes me too but "it's obviously not a good idea." i recently became single and he knows that and we've been hooking up since but it's always on his terms. he's struggling with some things so whenever he feels available he'll call me. but after he told me it wasnt a good idea, i decided maybe i should stop before i get too emotionally involved. and he calls me the next day to go to the movies late at night. there, he cuddled with me and almost treated me like a gf, very lovingly. we were also the only two people in the theatre so there was no one around that we knew to see us.

then... the next day, we both go to a mutual friends bbq.. separately ofcourse. and he acts like he doesnt know me. he talks to every other girl more than me (even though we're all sitting around a round table together). he ignores me when i talk to him.

im confused..... what is he doing?