it sounds like you've already made your mind up. Does your H know about your A? I hope you clued him into it since you're set on leaving him for this OM and wrecking OM's marriage in the process. Does OM have kids? If so, have you thought about the impact on them? Or how they will just love you (insert sarcasm here) as their new mom? Crazy I tell ya.
OOPS...sorry. My PMS is acting up I'm afraid. I'm a bit blunt today.
....Understand, that I can't, not be what I am I'm not the milk, and Cheerios in your spoon ~ Avril Lavigne ~ ..."Nobody's Fool"...