Ex and I have been living apart for two years. He has nowhere suitable to see the dc so comes round here. It usually works ok when he has not been drinking etc. We spent Christmas together with the dc, it was stressful but not awful and most importantly the dc were happy. He does have a deep rooted anger at not being able to live here with the family anymore. He drank every night, he has unfaithful and had more affairs then I could count and at the end made no effort to hide it, he was verbally and sometimes physically abusive but he still believes that I am wrong to have ended the marriage.
Tonight he came round and seemed sober, looking closer though he had had a few to drink and was quite hyper. I hate being round him like this. He started making himself and dc something to eat and was drinking a beer, he put some music on quite loudly, I asked him to calm things down a bit and I was clearly unhappy with the way things were going and showed it and it turned into an argument during which he called me a fat cunt (again) told me he can do what the fuck he likes in HIS house (again) and I am a lazy cunt who has had everything handed to him on a plate (again) he then handed me a plate of food and told me to "make yourself fucking useful you fat cunt", I knocked the plate out of his hand, this made him very angry he called me a lot of names, pushed me and threw a tea towel in my face and he then proceeded to tell my dc very, very personal stuff about our marriage that they are in no way old enough to cope with.
I told him to leave or I would call the police and he left BUT later on I realised he had taken a set of keys with him. I am concerned about him letting himself in and taking stuff (he is perfectly entitled to apparently because HE paid for it and it would not be the first time he has done this). So I have called the police and logged what happened, I told them about his abuse and asked if he could be warned about it and also about the keys. They are coming to take a statement on Friday (I will be away until then).
He will go mad, I know he will, but I had to do it didn't I? I did the right thing didn't I? I can't let him talk to my dc like that and about stuff like that. He told them I was planning on moving a new boyfriend in who would hit them 
and I was trying to get them a new dad! I don't even have a boyfriend, I saw one man, an old friend for about 6 weeks and that is the sum total of my romantic life over the last four years.
I just need some hand holding really because I think this going to get horribly worse before it gets better.