I really feel your pain it's just so awful, but as some of my dear friends have said to me, (even though I didn't want to hear it) it's time to start focusing on you now.
Yes, we don't want a divorce, yes it is the pits, but you deserve more than wondering what he's doing/thinking. I can't tell you how many hours I've spent thinking of him and OW2. If you let it, it will consume you. OW2 is THE worst skank he could ever have chosen. I let her into my head and gave her tremendous power over me and my well being.
No more. I don't think for one minute thy concern themselves with us, we need to learn to reciprocate.
I know it hurts, but you can do this. I've found I have so much spare time I'm having a blast with old friends I neglected, and new friends I have been able to get to know.