Trying not to lose it ( long post)

Em

Ok so to make a long story short I have an almost 5 year old son. He knows my bf as his father as he's been in his life since a little over a year. He has my last name and wouldn't have had his bio parents name on the birth certificate if it wasn't for child support adding him on since I have Medicaid. My son had no idea who this other man Is. he doesn't know that when I was pregnant this man assaulted me twice and hit my stomach and tried to kill me. Doesn't know that his "father" who I can't even refer to him as stalked me after I had him. I had to get a restraining order. This guy is a psycho. He's dangerous, his whole family is dangerous. They all lie and are very poor and uneducated. My ex told me he was raped by a man in the family but wouldn't tell me who. His family is basically a bunch of moochers that live off the system and have no jobs or anything. When he beat me up his mom bailed him out of jail and was mad at me. His uncle does drugs in the house and has prostitutes in and out. And his sisters bf is a well known drug dealer. Just so you can get an idea of the type of people I'm talking about. Why would I even involve myself ? I was a complete idiot and only 18 obviously with zero judgement. I can't change that now. But over my dead body will this psycho or his family ever have time with my son. They are dangerous horrible human beings. I haven't spoken to my ex in almost 4 years now so i dont know his current status. I've never gotten child support from him because I wanted him to stay away from my son. I was an idiot when we were together and never stayed in court to testify against him so charges were dropped. I've blocked him from everything but every once in awhile maybe once a year he will email me or find me on social media where ollimmediately block him. Last time i actually read something from him was last year. I found his email in my junk mail since I had him blocked. He had said hi and got no response so started telling me he went to a social worker and they said that me keeping my son from him was illegal and he was going to a custody lawyer. He's full of bs and honestly I don't think he could even pull himself together enough to follow through. But the possibility still terrifies me. He's a bad person. He is literally a psycho path and incapable of change. My biggest fear is him trying to get visitation with my son. I truly feel and know in my heart my baby would not be safe. He's almost 5 and has no idea this man even exists. I really fear for my sons life if he was in his care. His lack of common sense and his anger and aggression towards me would put my son in danger. I literally worry about this every day. We live in the same town I assume and have yet to run into eachother. About 2 months ago he found me on messenger abd I blocked him before he could send anything. Then just now one of his good highschool friends just friend requested me and I blocked him. It makes me so nervous. I'm terrified he will some day try and take me to court. And the fact that they put his name on the bc gives him automatic rights. I'm so scared of him finding out where he goes to school some point and showing up with a birth certificate and taking my son. Does anyone know from any legal aspects or been through anything like this how likely this is to happen? Or how many rights he has? Even tho I've never gotten any money from him and my son doesn't even know of his existence