FGS, ow not to blame, not connected, owes no loyalty, no, only in the sense that you should never do anything evil to another human being. You wouldn't say of someone who robbed your house that it was ok just because they didn't know you. And often, as in this case, they DO.
Although, I like to think I wouldn't take pleasure in hearing about such misfortune: I find my peace in the knowledge that they are both nasty, deceitful, damaged, ugly people who are welcome to whatever pathetic excuses for lives they manage to carve out for themselves, as long as it doesn't touch mine. Good luck finding contentment and happiness knowing who they are inside, what they are capable of.
You'll have to excuse me, I only chucked H out just over a week ago! 
Actually I want the real karma to be that I have a fantastic life, full of love and joy, loved properly by someone who knows what that means. I want to get to the stage where I even want H/OW to be happy because I am so deliriously so. Not there yet though, as you can probably tell 