How did we get here again old friend?

How did we get here again old friend? I stuck through another 3 months only to be betrayed in May, then once again last night. I can’t even begin to describe the depth of emotion I feel right now. I’m sad, angry, frightened, and so bitter. All I can think about is how this worm of a man I married doesn’t love me, nor does he care about the effect he is having on my life and the lives of our children. Break up the home, force me and my children to move to a cheap apartment, force us to lose everything we have worked for and held dear for a 21 year old girl he’s never even met. That’s the stinger right there…he’s never even met her, and yet her feelings and emotions take precedent over mine and our children’s.
He is the most evil person I know. The only reason he is doing this is because of my weight; which, let’s be honest, I’m not happy with either, but I thought I had someone who loved me for me. I can understand why he feels the way he does, what I can’t understand is why he didn’t even try. He made no effort to be a good man, a good father.
One of the big red flags that told me he was messing around again was his lack of interaction with our children. And it makes me hate him. I can understand pulling away from me, but to not acknowledge your kids? He doesn’t even know the names of their teachers, what they have for lunch, what their favorite books are, who their friends are. He is an island and he has created that island of his own doing. I just don’t understand how a man could not care about his kids or about their hearts. Who the fuck did I marry?