Me/us, maybe?
But... my timeline would basically be
June 2017 WH starts A with COW.
End of September/beginning of October I suspect A, and keep questioning but he lies/denies/gaslights me.
Thanksgiving WH admits to PA.
Day after Thanksgiving, I start packing his suitcase, he cries and says he'll end it, is grumpy and mopey.
Get the phone bill for December, find out they're still calling and texting constantly throughout the day, which he thought was okay because... they stopped having sex?
I told him he had to be out 1/1.
He begs for more time, makes promises, I say nope, gtfo.
I expose to everyone (previously had just told his parents and godmother).
180 hard, go no contact with him (we only communicate via email when it comes to the kids or lawyer stuff, and make arrangements for someone else to be with kids for pickup/dropoff).
Go through mediation to legally separate.
The day after our second-to-last mediation session, I finally speak to him. Tell him I still love him, but he fired me as his wife and I will not share him with another woman. Period. And then I go dark again.
We had an appointment for 1.5 weeks later to sign off on our separation agreement.
In that time, he ended things with OW, moved out of her house (she assaulted him), begged his family to let him stay on one of their couches, and used his mom to get in touch with me because I was ignoring all his emails since they didn't have to do with kids/finances/lawyer stuff. That was April 2018.
The difference when we started having contact again was noticeable. He went out of his way to be transparent, make me feel as comfortable as he could, stop going out, stop drinking to excess, make it clear to OW he wanted to be left alone, told his bosses so he could be transferred farther away from her and to a more public position, cries about how badly he's hurt me, is reading self-help books, practicing mindfulness and meditating, has panic attacks sometimes if I don't answer him fast enough, because he he's worried I'm going to leave him again...
What made the difference was telling him in no uncertain terms that I wasn't putting up with an A, I was fine without him, and letting him see what his life would be like without me in it, at all.