Not going back to husband

Hey ladies I really need some advice on not going back to my ex husband I live with my mom and he lives with his mom now after we moved out of our house. We still share a car note together of $18,000 which I just want to own myself but I can’t afford it right now. Anyways, I found out he was cheating on me and lying to me our entire marriage (6 years) I was absolutely heart broken. I still find myself feeling lonely and wanting to be with him I think out of bordonees and loneliness. I need some tips on not going back to him and what I can do to not think about him. Please help I want to move on and heal from this heart break but it’s hard because of my feelings and is sharing a car.