Why now?

My ex just sent me a friend request on Facebook after all most a year he started calling when he went back to jail i only answered once to tell him to leave me alone i moved on im happy now. It looks like he just got out i really want to message him and tell him to leave me alone. Its not like we ended on good terms he beat the shit out of me and shot me up with heroin bc i didnt want to be with him anymore i wanted to get clean and stay clean. I really hope this new girl knows what she is getting into. I met the man of my dreams and our son is due February 28th. What do you guys think i should do?