How do I apologize for lying to my boyfriend that I went to a party and didn't tell him and he found out ?

I went to a party and didn't tell him but he found out through a picture on fb that I went this wasn't the first time I did this and he broke up with me but we still talk he can't trust me that I want to change i admitted I was wrong and said sry so many times already but he can't forgive me. we've been broken up for 2 weeks now and nothing changed with us but he tell me he doesn't know what he wants to do with us then he say he wants to be with me and then he say he doesn't want anything to do with me. Please help me