Please give me advice?

I'm 15 and have been in love with this guy. Sumtimes he can be the nicest guy ever and be really sweet but other time he just talks about sex and how he wants to "****" I'm a virgin so it's like weird cuz I want to but I don't wanna b mor hurt. He has ****** me over in the past but he keeps coming back to me.. Does that mean anything? I don't know what to do anymore