Hi i think @Hocuspoc is giving wise advice
However now is the time to fucus on yourself and the kids and to block him
I think the OW has behaved as badly as him maybe there is a chance for them both to work through their 'issues'. seek forgiveness 'change' but they will have to put in a great deal of work on them selves. In time they could change, I'm afraid some people never do and remain dysfunctional and flawed human beings.
I don't know this husband of yours the fact he hasn't said much via text could mean he knows he has lost something so dear and precious that he has no words to express.....
Right now DON'T forgive ...
Fucus on the love of your family who will.take care of you .
Your husband has to take responsibility for his stupidity , lust and arrogance.
No one else can.
I pity him
All the advice about NOK , solictors is ace
You probably don't know him like you thought you did so take care