No one can tell you when you have had enough and need to move on .... except you sweetie.
I understand having hope and holding on to that, but sometimes you just have to believe the actions of the person and accept .... Acceptance is the hardest part for me, but once I get there and let go things get better ....
You have to trust that God has the plan, even if he is not sharing it with us. All of us deserve the best, and if you dont feel the love from him by now .. you probably want to take a closer look at what your holding on for.
Whatever you decide I strongly suggest that you put the feelings aside and operate from the head on the divorce and support. That is when it gets really ugly... and when I went through it, I could not believe and would not have believed how awful they can be... Keep you and the kids in the forfront of your mind cuz no one else is going too.