Well, you have the right idea. Go run, do yoga, etc. Visualize. Focus. Expend energy, because you are still angry (I know, I know.)
Things won't change until you change. I can assure you of that.
I'm not saying you have to be friends, but acceptance and friendship aren't the same thing. Friendship is something different to you than it is to H. Finding what that balance is while parenting the kids is going to be the challenge.
Your values and his are not always going to be the same. But they weren't anyway. Co-parenting is MUCH better than parallel parenting though and your kids will need that to be healthy. I assure you as one that has walked in those shoes.
His leaving doesn't have to make sense. His actions don't have to make sense. They likely won't to you. But finding a way to co-parent is worth every tear and every joy.
If it was easy, wouldn't everyone do it?
For the sake of your kids health and balance, find a way to set the rest aside. It won't come easily nor quickly enough, but it is worth it.
AJ
"Our lives begin to end the day we become silent about things that matter" MLK Put the glass down... "Yesterday I was clever so I wanted to change the world Today I am wise, so I am changing myself."