"he's not going to listen since he's convinced himself as the better choice."
I don't think you understand. This is not a competition to see who is the better choice. YOU are her H. YOU are the children's father. HE is trying to steal them away from you. Start being more assertive about it and stop encouraging your W from taking advantage of you.
I understand it's hard because you pretty much gave her everything. So let me put it another way. She has everything. What could you possibly offer her?
I would seriously consider leaving and making arrangements to have the children with you 50% of the time. You're not her bodyguard. If she wants the OM, maybe you should give him to her and see what he's really like.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.