I don't want to not invite her and make it feel like I am leaving her out on purpose. But then again I dont want to invite her if she will see it as a slap in the face/reminder of her failed marriage. Their wedding was at a court house and we are having a ceremony so idk if that would also upset her. And she is also single currently, gone through a couple bf's since I was introduced to their family but nothing was ever too serious. So I don't want her to be upset about her ex-husband re-marrying when she isn't anywhere near that position herself.

But here is some background, my fiance shares a son with his ex-wife and the three of us all get along so well when it comes to coparenting. I mean, they kind of argue about the shared debt they still owe because that was poorly split up during the divorce but other than that we are great. We talk often about how to raise their son and how to deal with new issues that arise with him or our schedule and its just great. His son is going to be the best man in our wedding and I feel kind of weird talking about this subject with her. She seems cool about it. She even asks questions on how things are going with the wedding planning and our daughter and my current pregnancy so its all super friendly, just awkward and that's probably just me over-thinking it. But idk what is polite or not. This is my first (hopefully only) engagement/wedding/baby daddy.