Very long story short here but I'll give as much info as I can without it being identifying and without drip feeding.
So I was with my ex for 3 years, we have a 2 year old son together, for the past year he's had regular (ish) contact which I have helped to facilitate by dropping him off and picking him up etc. Last year we got back together for a few months then it ended, recently he told me he'd met someone and had been with her for around 6 months. Absolutely fine by me. Recently they split, he ended up back in my bed and now he's gone back to her. My own stupidity I know.
Anyway, from doing this I have found out a lot about her which concerns me greatly. She is 18 years old, self harms regularly, threatens suicide, lines up pills to take to overdose, when they argue she grabs a knife (he says to harm herself with), makes wild accusations about people (think rape, abuse), sleeps about and to top it all off, apparently hates me. She also self harmed and laid out tablets with 2 other young children present in the house.
I am now concerned about him having our son at his house, he has told me she's been around our son for the last 4/5 months so there's no doubt in my mind he will continue to have her at his house while he has our son there. This isn't about me being resentful or anything I am genuinely concerned at this girl being anywhere near my child, especially if she knows we've been sleeping together the past week, she hated me anyway so god knows what she thinks now and how is that going to play out with her behaviour towards my son.
Where do I stand with this? I'm thinking to come across kindly and say he can no longer have access at his house and maybe suggest a contact centre? If anything was to happen it would be me social services got onto, intimately I'd be sending him there knowing that he's allowing someone unsafe to be around our son. I feel the risk is too high.
What would you do? And where do I stand with this?