Should I do anything ? Or just leave the situation alone ?

My sons father has not seen him since dec 22 my son is now 6 months old he’s only text and asked about him twice he was very abusive my whole pregnancy he even got someone else pregnant when I was 4 months I still took him back and allowed him to be apart of my pregnancy even though he hurt me I felt like I could somewhat “fix” our relationship I was WRONG the abuse just began to get worse and worse I finally broke up with him after the last visit he had with my son because he starting hitting me again I want to put him on child support but i don’t want to deal with him and i doubt he’d even pay I just hate that I have to do all this alone I’m only 18 I know my son is my responsibility i do my part It just bothers me knowing I didn’t make him alone.