I don't know if he likes me

I want to know if my ex still likes me. We hadn't seen each other in years and when he came back to school he kept lookingbat me and asking me sexual questions. He said it was a joke. I still really liked him and I asked him out but he said no. He keeps getting erections in maths and telling me that i caused it then saying it was a joke but he still doesn't wanna go out with me. He keeps telling me he thinks I'm beautiful, I have a nice ass and that he wants to bang me but he won't date me. I'm really confused and need help. I haven't asked him out again since the first time but my friends told me he won't date me. The thing is I think I'm in love with him. Can I need please have some advice?