I hate to say it, but I know very similar to what you are going through. STBExH came out as gay in April after being indecisive for the previous few months and he'd gone and found someone to have sex with online. We have a 3 year old and a 7 year old.
We are still living together, because it is easier for the kids. We have a big house, so plenty of space for him to have his own bedroom and separate living room to hang out in the evening, but its wearing me down.
He is so completely normal, happy and getting on with life. I'm on antidepressants and having to pay for counselling. I just don't understand how he just cares so little for the 11 years we were together. We're struggling to get our house sold, its a shite time of year to be selling, and with the upcoming budget its even worse.
I know I just need to get out the house and have my own space, but can't afford to to pay rent and half the mortgage too. I am managing to keep civil for the sake of the kids. I've a co-worker who is going through a really bitter custody and access argument with his ex-wife over their child and I've vowed never to get like that. My co-worker has turned into a bitter man because of it and I don't want to turn out like that, he doesn't get to see his child, and I'd hate that, and at the same time, I couldn't handle the stress or responsibility of caring for our 2 children completely on my own either.
I just need to get the house sold so I can move on. I mean, I'll never trust another man again, so that's not what I mean by moving on, but just so I don't have to see his smug happy face every day