I'm in the exact same boat as you with the exception of my W says she still loves me. Yet she is living a OM while we have "joint custody" of our kids.
It's a long ride, you're just getting started the ride gets worse if you let consume you so keep doing what your doing to keep you mind off of it. Otherwise it WILL deteriorate your R with your kids. I've emotionally lost one of mine and the other needs counceling now because I let it consume me and devoted no time when they were "visiting" with me.
Please, be strong for them and through that you will be strong for yourself.
Hang in there.
dday
Me 35/XW 33 S13 & S12 M: 10/17/98 OM & S: 07/08 D final 06/09/09 12/03/09 - 06/13/10 "Piercing" 06/13/10: Engaged to Re-marry 10/17/10 06/25/10: Expecting baby #3 2/14/11