Questions: Relationships

So I just found out that I’m pregnant. My ex and I broke up in January but continued seeing each other for our needs. I have infertility so I didn’t think i would ever get pregnant. When him and i were together for 3 years we tried to have a baby but wasn’t successful even with the help of a dr. I slept with him and only him the last few months. I know he’s the dad. I left him due to him putting his hands on me. I had a black eye and a broken finger. He went to jail for 90 days. We had sex in July 22,23,30 but in August he ghosted me due to me not wanting to be more than friends again. I told him i wanted to be friends and work on ourselves. He couldn’t handle that so he ghosted me. I don’t know if i should tell him or not. He has another baby that’s 3 or 4 years old. His first bm left him and moved to a different state so he hasn’t seen his son since he was a newborn. That’s breaks my heart because i want him to experience everything that he missed but then again why do i care when he put me through hell the whole 4 years we were together. My friends and family agree that i shouldn’t tell him. I feel like once i post the announcement that our friends will tell him and he’ll put two and two together.