Julz, I read something similar to what Rick expressed above - your H will probably look at this woman someday and feel guilty and then he may start to wonder what kind of woman has an affair with a married man. It may sound hypocritical because he got involved with her but I do think one day, he's going to think about it and she's not going to look so good in his eyes.

And I agree, what they have is not love. It was built on lies and deception - that's not a very good foundation for a long-term R.