Ex Sex

So my ex came over last night to talk because he wants to try being friends so that our relationship might be better and I we ended cup cuddling and then having the best, romantic sex of our lives. I'm just not sure how I feel about all this. I miss him like crazy and I want things to work out between us but the last time we broke up and spent time together, we were so much closer. There's just always been so much heartbreak with him but also some amazing memories and some very deep feelings. I would really appreciate some advice on what to do or how to feel about all of this:/