Don't call the OW. She has nothing to say you need to hear. Is there a way to block her texts on your phone? I'm not very savy that way, but if it's possible I would. I don't even think this is the point to talk with your H about her. It's just drama you don't need.
I'm glad he's seeing a C, but if he thinks the therapist is wierd....maybe another one? Or could it just be he'd think any therapist is wierd at this point?
Glad you're not feeling bad. Somedays that's the best i can do.