My ex got the valuations, they said £365k. He offered me £175k. I was like, er, dude, that's not even half, let alone negotiating!
He said "take it or leave it, I don't care". So, I said OK, we'll put it on the market, it's the only way to find out, and we'll both have to move (the logistics re the money etc would have been a LOT easier for me if we had done this) but he wanted to stay there, so in the end I settled on £180k. I owned half the house, I had bought half the house. The way he carried on you'd think he was making it over to me as a fucking gift or something.
Still reckon I should have got £190k, or at least £185k, but, like you, I decided to just give in and walk away - my sanity was worth more.
He kept yelling at me "when are you leaving, why are you still here" - well, there's this thing, called a financial settlement, you have to DO IT! It isn't going to do itself and I can't do your part of it.
But, you have to keep positive. I took myself off to the theatre and cinema a lot and painted my nails every week to keep cheerful!