I have just found out that my daughters father, who she sees most weekends, is back with his abusive partner. She has physically hit him and left him with large bruises all over him. He also claimed she never cared about his kids and would treat them like second class citizens compared to her own. Now he's back with her and I have said I absolutely do not want our daughter in that environment. He says I am being unreasonable but how can he assure her safety? I feel like he's making me lose my mind again (a common theme when we were together) and making me wonder if I am making too much of it.....I'd really value any input please