I get why you are being the MUCH bigger person by agreeing to move out but I suggest if you do move out that you use that as leverage for the entire settlement.
You and your W though not legally married were acting as a common law couple. The reason she was able to do so well financially and have 3 kids is in part because of your support as a W. You have contributed to her success - don't let that be cast aside.
I know how hurtful this is, stay strong & happy.
Enjoy your kids
---- M 39 H 35 D5,D4 M 4 T 9 ILYBNILWY 5/18/11 Left 7/11/11 Divorced 12/1/13