Am I wrong

My STBXH is upset that I won’t talk to him or be friends. I expressed to him that I cannot be friends especially with how I feel. He fails to realize that he left me so he doesn’t get that luxury of being able to talk to me constantly. I told him if it’s not about our child then I really don’t want to talk to him. The main reason I can’t talk to him frequently is I start getting false hope and I’m unable to heal. He then starts giving me false hope saying maybe we can work things out then the next day flips completely and say he doesn’t want to. This has happened multiple times and I’m just tired of constantly getting my feelings hurt. I finally told him to stop contacting me and he says that I’m being mean and he can’t deal with that. Now I’m feeling bad but I want boundaries to protect my feelings. Am I the bad guy here?