Holiday sounds fab, well done for going on your own.
I hate that when you’re angry with yourself for being angry/jealous or whatever. Feel the jealousy for a bit it’s only normal. What gets me is that OW seems to be slotting in where I should be, which is p*ssy in one way, but then on the other hand I think that my H hasn’t changed his life at all just put in a substitute me which will eventually get wearing. One of his big things was that I never wanted to do anything different, now it seems that I’m doing new things and he’s doing the same old stuff. Plus he will never enjoy family time as the kids won’t have anything to do with her.
Get knitting the niece a jumper or something, give yourself something to do.
