That e-mail was a bad idea. Quoting scripture and guilting someone isn't the way to success. Doing the guilt trip will just drive him away.
I'm going to give you my opinion on dealing with cheating husbands and you can't take it or leave it since it may not be classic DBing.
If he is with OW, I would kick him to the curb. No coming back to the house, no sex (this guy has been have sex with someone else...possibly some skank with STDs), and no talk to reconciliation. Be done with him and truly honestly feel it. Don't tell him you'll do your wifely duties....tell him to get out and stay out. Ask any LBS guy, even ones that have cheated, how they've responded to that. They've chased after what was no longer available. You are suddenly a challenge. You are unavailable. You are attractive. But you can't be a pushover about this. You want all or nothing from him. Don't give in the first time he starts expressing that "maybe" he wants to be with you. Be unavailable to him entirely until OW is out of the picture and at least until you feel strong enough to make it without him. I've seen too many scenarios where the WAH vaccillates between the wife and the lover...and enjoying keeping them both dangling on a string.
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt
