LOL to Anonymous. Chanel, I suggest: either you ignore him (which would be really boring). Or you could take the moral high ground, find out who this girl is that he's going out with, and while she is with him, go up to him and ask to have a private chat with him about 'the other night', and when he refuses, mention to the girl (who you 'don't know' he is going out with) that he kissed you and now doesn't want to even know you. You could even start to cry if you wanted.