"saying I was acting like a d*ck and that if I really want to be with her I'd show her with my actions."
The next time she says something like this, hold up your hand to stop her. Tell her that she has made it clear that she was leaving and in fact she was even seeing another man. That you are not interested in sharing her with another man and that you've proven that you're a great guy and doesn't have to prove anything to her especially since she said she's going. Then walk away.
Start standing up for yourself.
When was she leaving? When it comes to the kids, help them out when they need it. But do it for the kids and not for her.
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.