I can imagine it must be awful to have to coexist with a WAS, but you can handle it.
I think when we focus on the exciting things ahead, it helps take away some of the sadness. I've got a laundry list of things I plan to do in my new life.
S5 always asked for a brother. I used to tell him he was the baby, and he would never have a brother. Now I think...who knows, he might end up with a step brother. lol