It's considerate in a way that he let you know personally about the engagement, rather than having the kids be put in the middle.
It's still tough emotionally.
Only recently have I started turning the corner.. and what a beautiful sensation that is. Get really busy, involved. Luckily my mom and brother were visiting right before and after my former spouse was having his reception in which the kids were invited but not involved. I could have gone bonkers with the thoughts of loss bouncing in my brain, but I was so engaged with family here, getting the house ready for market, resolving issues that I was freed from the emotional chains of my own anxiety.
Anything he does in his life has nothing to do with mine. The only hurt is the hurt I allow. I am no longer any of his business. He is no longer any of mine.
It's hard to let go of the last threads of victimization. I know I vilify my former spouse with his scant interaction with our children. I have to let that go. It's a broken record. It serves no purpose. As long as I blame him, I hold myself back.
Focus on what's good for you. Cuz then everyone who matters is a winner.
