It seems your H has had more than 2 EAs and now a PA. Am I understanding that correctly?

Your H doesn't do this ^ because of you. This is his problem.

When you picture the trip to Disney, what does it look like for you? Will all the child care be done by you? Your kids are tiny, Disney won't make much of an impression on them.

You have worth. Has your H talked at all about giving up his PA? Do you want to share your H? I'm not saying do anything drastic but rather think about what a good marriage looks like to you. People who are serial cheaters, don't easily change their behavior. Is he making any steps to do that?

Maybe you need to become the WAW in your mind.

Have you read Tallula's threads?

Me 57/H 58
M36 S 2.5yrs R 12/13

Let me give up the need to know why things happen as they do.
I will never know and constant wondering is constant suffering.
Caroline Myss