I don't have a good answer for you. I tend to struggle with decisions like this. And am also having similar internal debates regarding financials.
I certainly would not allow yourself to come out of this less then even. Financially, you should not have to suffer a loss when the law is in your favor. And I would not base any decisions with the hope that he will see you as a this wonderful self sacrificing person and come back to you (I don't think that's what your doing at all).
At the same time, I would not take advantage of a legal aspect that you yourself see as unfair. If that's the case. Go with a decision, that you will look back on and be proud that you did not allow someone to take advantage of you, but at the same time proud that you made a decision with fairness and respect for another person.
If you purchased a home with a friend and had to sell it due to your friends job transfer, How would you handle it?
