Tristan, I'm here because a friend ask me to look into your thread. My wife went through a similar period and has definite bipolar/BPD tendencies. I'm in agreement with everyone that it is NOT your responsibility to pay for her to leave. I didn't pay for my wife to leave; she financed it herself. Plus the kids stayed with me.
I'm not at the end of my sitch yet; but her moving out helped me heal the quickest. We get along great at the moment; but I'm not financing her life. That's my wife's responsibility.
Be friendly to your wife; but you don't have to be BFFs right now. She's breaking up the family. Look into yourself and get healthy for your kids sake. And DO NOT start dating other women!! WRONG! WRONG! WRONG!
You are not ready for that AND you are still married. Take the high road!