Everything looks good to me except the part about exposing to your wife. I would let HER call me after she finds out that you exposed to his wife and sister, etc..
I agree with the above BECAUSE OF THIS:
Originally Posted By: gucci loafer
"I know I haven't been the perfect husband but you are having an affair, so don't blame me for that. That is totally YOUR doing and I am not apologizing for that."
You save a trip to meet with her and use less words that could trip you up in the future. The less you say to her the better.