I am so upset. I haven't slept a full night since my exBPD boyfriend and I split 6 weeks ago. He's already with the woman he was unfaithful with and I knew he had introduced my 4yr old son to her and her kids. She has 2 boys: 9 and 12. Ok, fine. There's nothing I can do about that. It killed me but I kept my mouth shut and continued to allow my ex 50/50 visitation. I'm in the process of obtaining both a lawyer and child support because although I say it's 50/50, I actually have this kid 80% of the time and my ex hasn't given me a dime. He keeps assuring me he will but of course, never follows through. I've had to move my son and I back into my parents house because my ex has bled me dry financially. Again, fine. Life isn't fair and there's no sense crying over spilled milk and all that.
Yesterday, my son mentioned a video game he was watching where "the good guys" slit the throats of "the bad guys". My stomach turned. I started questioning him and from what I gather he is being left unsupervised with these boys. I asked if they were nice to him and he told me that sometimes they were and sometimes they're mean to him. I asked if he liked my ex's new girlfriend and his answer was an emphatic no. While he said he liked the boys, he said that this woman yells at him and yelled at him for taking some Lego thing apart (I think. He's four, mind you

). I understand how kids can be. I'm an ex-teacher. However, I do not like that my son is being exposed to such graphic violence and being left to his own devices with these older boys. I know the odds of anything catastrophic happening are minimal but I dont think my son should even have to gamble with those odds. Also, this woman has known my son for a number of days, at best, and she's already taking the liberty to yell at him.
My ex told me that my son is under "constant supervision" while my son is with him. However, when I say that my ex lies so consistently that it is impossible to believe a word that comes out of his mouth, I am not even remotely exaggerating. He never even addressed the video game. I have no doubt that if I told him how uncomfortable I was with all of this, my ex would lie, tell me what he thinks I want to hear, and then proceed to do whatever he wanted. I do not want my son over this woman's house anymore. Am I being unreasonable? Overreacting? And of course, if I step in, my ex is going to paint me as the jealous ex-lover who still wants him (which I unequivocally do not!) and make me out to be some controlling psycho but whatever. I'm just so upset my ex would let all of this go on! Just had to vent because I've been sick to my stomach since yesterday over this.