I hope you have found some peace in this. I have yet to encounter my ex and his new soon to be husband in public, but I am not looking forward to it! They just announced their plans to marry, which I posted about in another thread. I think they're moving to another part of the city that I never frequent, at least!
I agree that my kids are absolutely the highlight of my marriage, and this whole situation has only improved my relationship with them as we have navigated it together.