I've just read the whole thread Dolly, and you've got some amazing support and advice on here, but I couldn't just read and run.
You are a strong lady, already you are coping well. When I kicked Twunt out after 22 years of marriage because he was slowly destroying me with his lies and appalling treatment of me, I felt like I'd been hit by a train.
It is a bereavement, and in some ways, it's harder, because the person who caused all the pain is still around, and not only that, they're living a new life and appear to have all the answers, and be unscathed. Like they've walked away from a fatal car crash without a mark on them. But please believe me - things will get better for you and worse for him.
You will recover from this, but it won't be overnight, and it won't be a doddle. But you will get there. You'll have good days, bad days and crap days, and ok days. You'll want to hide under your duvet and sob, you'll want to get your gladrags on and dance until dawn. Probably in the space of a week! I know I did. I was on such a rollercoaster, it was unbelievable. Some days pure adrenalin fuelled by injustice, rage, and 'how the fuck dare he' had me running around, throwing his stuff into bin bags like a duracell bunny on speed. Other days, I sobbed my heart out and felt incredibly weak and pathetic.
All of this has to be gone through - the highs, the lows. Whilst you are recovering, and 18 months on, I'm still having good and bad days, but neither so extreme, he will be in his honeymoon period with OW. This will be like rubbing salt into your wounds. Stay strong through this - remember that it will pass. As you already know, she hasn't exactly won a gold medal nailing this guy. What he did to you, he will surely do to her. Remember that the situation has changed, but the people in the situation are the same. He's the same arsehole who cheated on his wife, she's the same OW who fell for all his crap, and you're the strong woman who's going to get through it all. He will miss you, he will miss his kids. He is not going to come out of this without a scratch on him.
What you have to focus on, is that when he hits rock bottom and realises what he's lost, it will be his problem, and not yours. Do not allow him to guilt trip you with all the tears and angst. His tears, his angst, his problem. Get teflon twunt coated! Do what I do, and ignore, ignore, ignore. Sort out everything legally and through a solicitor, and ignore the texts, ignore all the fall out that he's caused.
Your priority is you. If you are ok, your kids will be ok. Lean on your lovely friends and family, lean on us, lean on counsellors, read Dr Phil, sleep, eat well, and focus on treating yourself as you would your best friend.
My ex is now going through hell, because after 18 months of living 'the dream' with OW, he finally realises what he misses. Shame, huh?
Good luck
Saffysmum x