re: My worst fear came true.

Agree. Humans are flawed. Dumping all your thoughts, emotions, dependence into another person is bound to end some form of disappointment eventually.

My question for the OP, if your intuition was hinting that your gf wasn't the right one and you have children, why wouldn't you be a parent and a man and confront her and then end it? You have kids, did you want them being raised in a home like that?