That's a tough call Heavy. I'd say stick to your guns and hold your ground. Being friends in this case is more than it sounds. Being friendly is showing your W that you have respect for her and the kids, but more importantly that you have respect for yourself.
Having respect for yourself often comes with a price and in this case it's going through what you are solo. Don't cave on that. She's allowed to be whatever she wants over the fact that you have a L. That doesn't mean you have to do anything about that. If having a L is best for you, then have it and let her deal with that fact however she needs to.
Stay strong.
M 39 W 36 T5 M3 BD - 1/15 Separated - Same Day Served 9/15 D finalized 6/17