I was his first and we had a crazy relationship that anyone could have seen from the outside wouldn't workout in the long run. We were really in love though. I made a lot of mistakes and so did he and when he went off to college he broke up with me. I was still a senior in high school and I was devastated. Well every time he would come home for the holidays we would have sex and spend a lot of time together just like we were still together. Everyone thought it was odd, and it was bc it was really emotionally confusing. Because every time he came home it felt like we were getting back together then a few days after he was back at school he wouldn't want anything like that anymore. 

Well for about 2 months between spring break and summer break we didn't talk bc he was upset that I had slept with another guy at a party I had at my house. But right before he came back home he apologized for overreacting and we were friends again. Then a few weeks into summer break we starting having sex again and here we are now and summer is coming to an end and we're still doing it and we're still acting like a couple.

Sometimes I think I'm over him and I can move on but then sometimes I have this sense of neediness and can't let go of this weird relationship that we have. I just need advice. How do I separate myself from this relationship without losing a friendship, and hurting myself again? I want us to be close bc we always have been but continuing this odd relationship isn't healthy for us.