Most likely guilt is driving that apology. She didn't need to apologize to you, but your daughters. She let them down and decided to not be there for them. They're not going to get that, but that's who the recipients of the apology should've been.
Good that you're holding it down. Btw, my W has also done some things here and there recently that I believe are out of guilt. Back in the day, I would've gobbled those crumbs to mean something else. Good on you for keeping going.
