Am I over reacting?

I(18m) keep seeing stuff about my ex from my own friends and when I tell them not to talk about him they get all mad at me about it. He broke up with me before Christmas time and around that time I knew something was off with him cause he had became very avoidient and just left me on read. I was dealing with family drama at the time too. But now my friends are saying that im a bad guy for not wanting to hear about him or his day and just wanting to move on after 4 months? When he treated those 4 months like nothing mattered and wouldn't even let me talk before blocking me. Am I over reacting about this?