I think the thing is (please don't shoot me) the women that go for guys after splitting have self confidence issues possibly. Let me finish... as in the women who are single then there's a guy in front of their DC's. I know one person very well who split up with the kids Dad, they had lots of men introduced into their lives quite young, even moving in with 2 of them but keeping their house as a back up, which to me wasn't the best sign. I think nearly all that she had a relationship with, if she wasn't living with them, they were pretty much parked at hers.
The way I see it, from what I know about this person is they have low self esteem issues, a man pretty much defined them. I hated the children who were young, growing up like this. They've settled down now, I hope it's forever I truly do. I truly believe her eldests probs with CAHMS were because of this revolving door of 'Daddies' who kept appearing. All the poor sod wanted was a hug, but their Mum was too busy with the men.
I appreciate if you're of low self esteem and self worth you'll let this happen possibly. I'm not saying that's always the case, or always an excuse. That's just how I read the situation.
I think it's a mature approach to at least love yourself before getting in a relationship.
Pot & kettle, my DH treats me like crap, I'm going to address that when I have the means to. But I can't do it with an empty bank balance and coppers to my name. He has gone beyond pissing me off, what he did and said this morning just shows what a cretin he is.
OP please get counselling, please get some kind of help in case for any reason you blame yourself for what happened. Really wish you all the best.