Everything Is Going To Shit

I know you guys know about the post I made about meeting the son I put up for adoption. It was amazing, but everything went down heal really fast. The father found out I met him. When I was 15 he was so abusive towards me. I didn't want to put that in one of the reasons I put him up for adoption because I wanted to talk about meeting him. His biological father was completely fine with me giving the baby away if he had no responsibilities... Well I got a text from my bio son's mother asking who Andrew is and he's threatening her to take her son away. My heart dropped. My ex and I haven't talked in years. All I know is he was on drugs and on the sex offender list. I was so upset. I told her I was so sorry and had no idea how he found out or how he found her Facebook. She blocked him and he made another Facebook, then I decided to message him and he called me a fat cunt and worthless for "running away from my responsibilities and pinning our kid on someone else". Yeah okay. Well... Yesterday my son's mother messaged me saying she is sorry but if there's drama going on in my life, maybe it's best if we cut off contact for a while. I was heart broken.. I feel broken.. I completely understand she just wants to protect him. I just wish I knew how my ex found out and ruined everything....