mehhhh

My ex tries to still spend time with me being it's makes his days the bestest when we do(yes those were his words) wants me and only me he claims and doesn't want anyone else if he can't have me. But he can have me he is just a commitment phoebe and when I tell him he can't have the best of both words and I only wanna love one person and that one person only love me he gets all defensive and says we can never be together again. So not only is he making and creating that thought in his head he obviously believes it. He's been I. My life for 8 years now, we only dated for 1 but we have so many great memories together and it just sucks knowing he needs to be out of my life! Recently he has tried to invite me to his house to make dinner with him and his mom and go to church with the both of them. 
Any advice on how to heal and deal with this