All those that are villifying Goosey need to accept that these decisions are made. Some children cope, some don't!
I had a horrible childhood, similar to the scenarios here and slightly worse also.
In actual fact in many ways I wish my mum had stayed with my Step dad as, once they split, my mum completely changed, and battles terribly with depression and alcoholisim. This gave me extra burdens that I had to deal with, sometimes a lot worse than what I had to cope with before.
But as I child I;
I self harmed from the age of 10, not in an attention seeking way, I learnt very early how to hurt myself without leaving much of a mark or do it in places no one would see.
I simply wan't able to feel certain emotions.
I didn't value myself, had sex very young and all manner of things.
BUT you are the mothers allowing this to happen, and I cannot 'forgive' my mum for abusing me, and allowing me to be abused.
So don't expect that all might be fine and dandy for you, it will also have a large impact!