Why not just go away for the weekend this weekend? The kids will survive you being gone for two days, W will have to deal with them all by herself (might be a good reality check if you've been doing most of the heavy lifting with the kids) and you could get out and have some FUN.
And go ahead and be a little vague and mysterious about your plans for the weekend - W might as well get a taste of wondering where you are and who else might find you attractive.
I remember checking into a nice hotel for a night when my ex and I were going through it - just 30 mins from my home, I remember being all teary at the desk checking in and the staff being so very nice to me. I just laid by the pool and had a margarita and ate a nice dinner in the restaurant and watched a movie in my room. Seems like so little, but it was very healing to me at the time to take the time for myself, when everything up until then had all been about taking care of my spouse and my kids.
