((((((Laura))))))
Hmmmm..... interesting.
I apologize, I didn't follow your situation from the beginning... is S15 your only child? And I don't remember anything about the "other guy"! What is the timeframe on that?

I know a lot of people believe in "staying together for the kids", but I have to say, I don't buy into that, at least once the kids are over 10 or so. The kids know that things are not right, and they feel the tension that is in the house every day. And I think it wears them down as much as it wears us down. Others might disagree, but I am pretty convinced that my kids are doing better now than before.

Should you see the C? Well, of course, there is only one person that can answer that. If you don't, will you always wonder? Can you picture any way that you would be happy married to H? And I mean happy, not just surviving. When you think about that, do your best to take the "other guy" out of the picture, pretend he was vaporized by aliens. The question is about you and H.

My gut says, go to C. All you are committing to is going to C. If nothing else you might learn something about yourself that can help you in the future.