To tell ds his ex can’t stay here?

[UlcerativePoliteness]

Both 17. She has a history of being very controlling. He has a history of deliberately winding her up. In short the relationship is a toxic mess.

He finished with her a while ago, but they carried on as normal, meeting up, her coming round.
The last time she was round they ended up having a huge row until 2am, mostly on her part. Ds admitted she hit him and called him a cunt. I have advised that this is not ok, that this is abusive and not to be tolerated. I also said she was no longer welcome to stay.

I’m sticking to that and ds thinks IABU.
I cannot dictate what ds does, who he has a relationship with, but I don’t want this under my roof any more. AIBU?

I don’t dislike his ex, and I don’t believe ds is an angel, they both seem to bring out the worst in each other, and I don’t want to have any part of encouraging it

jesus christ op, would you say the same if it was your daughter and her boyfriend hit her. WTF is wrong with you? She hit your son and you are basically victim blaming your own son ''I don't believe ds is an angel...they both seem to bring out the worst in each other.''

And worse say that you still like her.

OP I am lost as to why you 'like' a person who physically abused your own son.

Absolutely stick to your guns