This time last year I was miserable. In a relationship with absolutely no intimacy at all, no kisses or cuddles, he was (is!) a grumpy fart. Me and the kids used to sit in our respective bedrooms all the time as the living room was his room (he slept in there by choice too) and he was constantly moaning about something or other. I felt totally stuck with him for various reasons.
In January I grew some balls and broke up with him. It wasn't pretty and he didnt move out straight away (complicated).
I've since met a new fella and he couldn't be more unlike ex if he tried. He loves the kids as his own already (and I his) he always suggests we watch family movies together, play games, go out places etc. He is so affectionate with me and always hugs the kids (which is just lovely, ex never did) and so much other stuff I just never thought I/we would have. I guess I'm writing this as a message that if you are unhappy, don't think you can't leave. You can and you will both find happiness. (Ex is with a lady and he's totally a changed man, trying to start a relationship with the kids-though I fear it's too late for the eldest)
Merry Christmas x