Hi OP
I’m so sorry you are going through this. My ex husband admitted to messages, then sexting, then nudes then finally having sex. During this slow and extremely painful unraveling of the truth he swore in the kids lives he had not had sex with her. As it turns out he had including in our home whilst we were away. We were together almost 30 years.
it has been a painful journey made worse by his lies and lack of empathy but I can now say that I am living a much better life where I do not have to deal with his constant negativity and grumpiness or his bloody lies. I’m starting to spend a lot of time on me as previously I was always bottom of a long list.
in my experience and unfortunately the many other people who post here about their cheating partners we experience what is known as “the cheaters script” it’s uncanny how all (well most) follow this script where they minimise, deflect, blame before the “full” truth comes out and during this time you feel as if you are going insane not just with the agony of the discovery of the affair but the gaslighting, the lies and the minimising.
my ex is now in a relationship with the OW who was also married. He has the kids every other weekend who refuse to see her and so he lives this half life and for the first time is having to adult.
he is pathetic and I have zero respect for him and cannot believe how low my bar had been set to have put up with him for so long. Men like my ex and your husband are weak and we are strong stronger that we think. And I realised that I was doing the lion share of all adulting but put up with it because I loved him and like I said I set the bar low.
don’t make any decisions now, but do consider having him move out to give you breathing space. Block her on all socials she doesn’t need to have any further window into your life. I wouldn’t waste any energy on her anyway she is not worth it.
wishing you all the best.