I did tell her that I thought it could have been handled better and that I would let her know when I was going to introduce my GF to the girls. I don't know if I even needed to say that, but I wanted to get that off my chest.
I think that was a good response.
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I'd like to get some answers about what really happened, but I know I shouldn't. Water off a duck's back. I just need validation that I should just move on. Even if I asked, she probably still wouldn't be truthful.
You are correct, you need to let it go and you likely wouldn't get an honest response anyway.
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What's the best way of handling this? I don't know that I need a formal introduction. The precedence has now been set that we will be two separate groups at our daughter's events.
I'm going to disagree with the others here. You've been divorced around a year and your XW is apparently in a LTR with this guy. She's apparently going to start bringing him to your kids' events. I think you should meet him. Why I think that is simple- you are likely going to keep crossing paths with both of them because of the kids, and you don't want it to be awkward every time. Even if you sit apart there will be times when you're going to be in direct contact, such as you and your XW both going to talk to D after the event. You don't want to be in a situation where you're constantly going out of your way to avoid being seen by each other.
If you get serious enough with your GF that you start bringing her then extend the same courtesy to your XW (offer to introduce them).