@welshprincess1975, this is an appalling betrayal. It would be game over for me.
Your H is absolutely cheating, both emotionally and sexually. These two
self-serving, unethical Snakes have been making chumps of you, your DDs, and her H. He is continuing that agenda with his current downplaying and gaslighting. Re the sex-talk, LOL that ‘apparently he’s just acting younger to engage in conversation.’ His #1 goal is protecting their illicit relationship.
Your marriage is unsustainable, Princess. You now know that H is thinking of OW all day and night, even during sex, which she suggested. He has transferred his allegiance, so she is his go-to person and his primary emotional relationship. He uses you as a nanny, home appliance, and sex receptacle, but couldn’t care less about your agency, feelings or boundaries. His faithless behavior and unremorseful response to being rumbled scream disengagement and contempt.
He is NOT a good father. He’s a duplicitous, low-life father who has disrespected and demeaned his children’s mother with his emotional mistress for 2 years, thereby trashing his whole family and abusing the trust of all of you. What a terrible role model he is.
Princess, you cannot afford to underreact or be paralyzed by defeatist thinking. You must learn about your rights and options. You have plenty. Summon your anger and agency, and find a solicitor who offers a free 30 minute session. Marshal support from loved ones, and access IC to strengthen your self-esteem/boundaries and learn effective coping strategies as you make decisions. Also, check out the wisdom and advice on the survivinginfidelity site.
I agree with others that your having bipolar disorder is a red herring. The court knows that it’s a highly treatable condition, and I assume you consistently take your meds.
Regarding OW’s H, he too has been kept in the dark, so he absolutely deserves to have the same information that you do. I strongly advise you to inform him of their affair, using a platform that cannot be intercepted by OW. I would call him and then forward the evidence.
Keep posting here for support, @welshprincess1975. 