Having dreams about an ex

So I'm currently in a relationship that has been going on for over a year and a half. I truly love this boy. But he has been out of town visiting his dad for about a month now. I'm having severe attention withdrawals and idk what to do. Lately I've been having dreams about and ex of mine. One of them I ended up cheating on my current boyfriend with him. And another where we were just talking but I had a very real feeling of liking him and having a crush on him. He is currently just now dating a new girl too and I haven't even talked to him or seen him in 2 years. I really don't know what's happening. I want to talk to some of my friends about it but only one knows both me and him, and she also is really good friends with his new girl. So idk. I've been trying to put it out of my mind but it won't go away. I don't want to tell my boyfriend either because I don't want to hurt him and really don't know what's going on myself. Also, I live 2 hours away from my ex, so even if I did decide I wanted to be with him, idk how it would work. I don't own a car and I dont thing he does either. Someone please help me