Beth what a bummer!!!!! I am really sorry that you have to deal with this new twist but I do know you can. I know you will be feeling sad and hurt and many other emotions but on the board you still sound like you so that is good. Feel what you feel and then set each one free till you are at a better place.
You are a wonderful woman it shines through all the time so you believe that.
This is H's problem and always has been, yes we can accept our part but the decisions they made are theirs and theirs alone and they will wake up eventually. It is very rare the OP works out in the end, so Beth he will get his just desserts one way or another and how you feel about it when that happens is totally up to you.
Remember you have the power to live your life your way and for you and your kids. So try and focus on that and on what things you can change for you and the kids that you may not have done had H been around.
I send you lots of hugs Superwoman b/c you still are you have just encountered a little Kryptonite that is all. Keep busy take care and I will check in again soon. Have fun at your Mum's.....Kim