I have the same story as you. My ex and I have been together for 15 years. He is the one have numerous affairs but blaming me for everything. I was abused, bullying by him for so long time.
My children and I actually moving out next Saturday. The place we are moving in is only 1/3 of the size. And the maintenance from him plus my salary are much tighter, but one thing that I am absolutely sure is my children and I will be much happier.
So we all have to be strong and be positive that's I can think of, life needs to be moved on. Being happy or sad is entirely up to 'YOURSELF'.