I've posted about this before in AIBU, ExP's girfriend has been violent towards him and sent me abusive texts, but he continues to be involved with her. I asked that she be kept away from the children because of her behaviour and exp said he would respect my wishes, but I found out from the DC's (6 & 10) that she stayed over night at his house when they were with him the other weekend, and spent time with them the next day.
They are due to be with him this weekend, but I am worried about her being there again. Is there anything I can do to stop her having contact with them? Or am I over reacting about their safety? Any advice welcome.