Ex boyfriend after many years contacts me through facebook. I try to be casual and respond. but now?

I'm sorry I really do apologize before what I'm about to say but just block him I'm a guy myself and I have friends that treat women that way and it sad because it make all of us guys look bad he Is a scum and playing game plus the manipulate type don't worry about his feelings just move on and block him if anybody want you they would find the time to put in no matter how much busy they are god bless