kat- For me, it was this:
1. My H started to finally do something to change himself and started doing the 180 thing. He made me have hope for our marriage when I thought there was none. I saw that our life together could be different than the way before.
2. The OM wanted to push to the next level and I had to make a decision.
3. I didn't want to be a part time mom. I thought, "I may be happier with another man, but would I be miserable with that other man if I don't have my kids?" It made it worth it to me to do whatever it takes to get us happy and working.
4. I have always had guilt for what I was doing. I got to the point, after I saw H's changes, that I thought to myself...now, if he asks or whatever, I have to be prepared to tell him about the A. Once I did, the OM had less meaning to me.....realized that I didn't "love" them as much as I thought.

I'm glad I can help. At least my sin has some benefit to others. That's the only thing it was good for. I guess it did finally help my H open his eyes.....I could have done that in a different way, though. All in all, I wish I could take back it all.