I'm so sorry to read all of this AH. Your H is being unbelievably blatant. As though he believes you are/should be fine with his ongoing infidelity. That mindset probably isn't going to change any time soon, and I think protection and self-preservation should be uppermost in your mind.

He has nothing good to offer you just now, and wants you to a) be his friend and b) have a permissive attitude towards he and OW.

I think you are absolutely right to progress legal stuff at this stage. Take care ((((AW)))

T 13 M 7
Me 48 H 46
SS 15
BD 7.14 PA
D final 5.16 (H filed)

We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus