Ex boyfriend...

My ex boyfriend is unbelievable I don’t know even know where to begin I needed to vent so....when we first started dating it was amazing and we went through that honey moon phase and then about 2 months later he cheated on me and about two weeks later I caved in and got back together with him and we dated for a bit, and i don’t know then he broke up with me because I wasn’t making him happy all because I asked him to stop doing something that was illegal anyways he broke up with me and now has this new girl he likes and I don’t know it hurts every time he asks me to come over and then goes to hangout with that other girl her names Emily but still why would someone do that he makes me think that there is still a chance and then tells me a week later that her parents are coming over to meet him I know I shouldn’t worry because I’m 18 about to graduate but I don’t know I still love him and it’s hurts any advice?