Your Husband is a very very lucky man to have you.
I had an affair myself about 10 years ago. It ended very ugly and I did a lousy job of dealing with it with my wife. The pain stayed in my wife and poisended her for eight years when she fist asked me for a divorce... Its a long story and I plan to get around to sharing it here in the weeks to come.
Gosh I bet I set a record in how many mistakes a person can make in a marriage and still be married. My wife is a very good lady and I am very lucky to have her.