This has, no doubt, been an unspeakably difficult road for you.
You have been a bridge to your children's healing.
You have been a great mom. And that is what they will remember. That their mom protected them when it counted. Or at least tried.
Isn't this why many of these MLCers get into this mess to begin with? B/c of abandonment issues with parents? So, you are doing your part to prevent your kids from feeling that.
In time, their R with their father will iron out to something that they may or may not like, one that you may or may not like. But, again, that is your H's loss. Much of this already has been.