Things are going well for you in the romance department in Oregon. Good for you, you devil.
As for your S8, I'm guessing it is a multitude of factors, one being the D that is coming fast. My D5 is having trouble w/ our D as well, so I'm not surprised w/ your S8. He will hit his rough spots through this, as will your D, but as long as your children have at least one steady source of influence and love, they'll come through just fine.
I worry about my D and I'm saddened to hear about your two as well (not to mention what Kalni's kids told her a few days ago). That is why I think divorce sucks when you have kids involved. I could have been in much better shape about my divorce if my D wasn't so adversely affected by the whole thing. That part breaks my heart every day.
Hang in there for them. There is no way you'll be anything like E.D. was w/ his kids as you are an excellent father and a very good man.
Karma is looking on your love life and it will also help you guide your kids through the rough spots of divorce.
