Am I being overdramatic for being hurt

I was texting my boyfriend because I'm worried about my 25 year old. He has had some mental health issues and joined a cult. I'm serious when I saw her joined a cult. He got super religious one day and then ran off to live in a commune. He recently stopped talking to the whole family but he's been brainwashed to think he's in normal living conditions. They take communication away if you get on trouble. They take food away and back in October he got BRANDED. We've all been so worried but he doesn't see anything wrong with this and thinks this is fine. He posts about it sometimes on tiktok and why he joined this group. He said he joined it because of when he was 17 and him and his siblings were removed from my care and his great aunt would force him to do sexual favors on her. He struggled deal with that trauma and found this group later. He talked about this last year and that was my first time finding it out. My aunt makes excuses for that saying she was lonely and there's nothing I can do because he's an adult now. He has to be the one to press charges. I also found out that my mom knew my aunt was weird around him but did nothing because that's her sister. Instead my family has pointed fingers on me saying none of this would have happened had I been a better mom. I lost custody because made a mistake. I put saving my marriage before the mental well-being of my kids. There dad was extremely verbally abusive towards them. CPS took my kids because my son showed his friends mom some texts their dad sent to him and she reported it to CPS so they took all my kids. My youngest girls were adopted out because I wasn't making progress and still try to save my marriage and my son just aged out the following year. I made mistakes. I put a man before my kids but I do not think it's fair for them to act like my aunt who committed a crime is at less fault than I am. She was legally responsible for him and is the one to blame and should be held accountable. Which is what I was trying to talk to my boyfriend about but he kept insisting we were both at fault when she actually abused him and commit a crime. I'm stressed because he's in a cult and I haven't heard from him in a long time. I needed comfort in this situation

Edit: I lost custody of my children because of what my ex husband did. Not things I did. My only "crime" was trying to save my marriage. My rights got terminated because I hadn't made any progress after over a year do they pushed to terminate

@G very disgusting to act like my child being in a cult is a good thing when they take away communication and food from you when you do something they deem wrong or sinful. He let them brand his arm does that sound mentally sound? Do you know what it means to be branded? He's in danger and is brainwashed and it's disgusting to suggest otherwise just because I made some mistakes