You sound so much stronger 
My friend had a particularly aggressive form of breast cancer diagnosed two years ago. Whilst her husband wasn't cheating on her, their life together was governed by his oppressive, moody and unpleasant nature. When she found out about her cancer, she went home and told him, explained she had to go into hospital for a mastectomy, followed by chemo and radiography. his reply was not to offer support, but to ask "who would be cooking his tea, then?".
She spent the night thinking about it and realised that if she survived her cancer, she didn't want to be married to this person any more. And if she died, she didn't want to be married to him either.
She was divorced before the end of her treatment and has never been happier.
She decided life was too short to put up with constantly being second best. Her two sons supported her and are very happy for her, they finally saw what their father's priority was - himself - and that mum was their true hero.
Keep true to yourself, is her motto x