SeagullsRule As you know, I don't agree with some of the views espoused on this thread and think that pride and ego often get in the way of honest communication. I also think it's healthy to discuss temptation in a marriage for numerous reasons. It prevents secrecy, which is an accelerant to an illicit attraction - and often the partner can see another party's agenda much more clearly and is in a better position to advise their spouse about how they deal with the feelings they are having.
People who are married to those who would have a major flounce and hissy fit if their spouse dared to admit fancying someone else are therefore much more likely to keep secrets, with all the attendant trouble that brings.
However - having read two of your threads now and while still supporting your H's actions in telling you, I will say that a few things are happening here that give me disquiet.
His reaction seems to be disproportionate to the circumstances. I think he is either hiding more involvement with this woman than he is letting on, or he is wrestling with his sexuality. If that seems a leap for folk who have come to this thread "cold" then read the last one.
Secondly, I have always said that a disclosure like this hurts. Of course, the hurt is far milder than the agony of an affair, but it hurts nevertheless - and yet you seem to be more concerned with his hurt and his pain.
Which brings me to where I have to agree with some of what has been said on this thread thus far. You are taking way too much responsibility for his feelings and your relationship. It is rather like infidelity - it is the role of the adulterer to get to the bottom of why they have behaved like this. Your H seems to have many demons - and perhaps some mental health issues - but you seem to be mothering him and treating him like a sick child.
You both have a responsibility to affair-proof your future marriage, but it sounds as though it's only you doing this.
I think your H would benefit hugely from some counselling, as I think there are some deep rooted issues that are unravelling here and I suspect this attraction was merely a catalyst for a more difficult journey to come. Now that's going to be really tough for you - and you will need help too.
Don't submerge your own interests and your own needs in all this.