Divorce/Seperation

My husband and I have been married for 11 months together for 3 years. I recently decided that I want to get a divorce due to his additions and controlling behavior. He, on the other hand, wants to separate and revisit us in the future. I told him that would be pointless that we should just go our separate ways but I keep changing my mind which is making things confusing. We still have a sexual relationship even though we don’t live with each other. He keeps the baby three days and I keep her four so it feels like we’re still together just separated. I don’t know how to cut all ties because some times I just get weak and I miss him but I know we can’t be together. I don’t want to repeat the cycle and he hasn’t shown or said anything to me that says he will change. How do I just cut ties with him and keep it strictly platonic instead of getting weak and caving in again. Because I don’t want him to be my husband anymore but I also miss sleeping next to him every night. On top of that I’ve already met a guy and I feel so bad for keeping both these relationships active. I know I should have healed before I moved on but our relationship was so bad I thought I did but the moment he moved out I realized I was still grieving us.