An emotional affair where the two people see each other and aren't separated by thousands of miles is usually very rare.
Mayzo I suggest you at least protect yourself by using condoms with him (assuming you still have a sexual relationship), as you are turning your head the other way.
I don't think I could stand to have my DH anywhere near me if I knew he was having an affair, emotional or otherwise.
There's a book called 'not just friends' by Dr. Shirley Glass. It explains the dynamics and the start up of emotional affairs.
Once the two build an emotional connection, it usually goes up to the next step as they feel like 'soulmates' and 'peas in a pod'.
Emotional affairs can be terribly intense. They send thousands of texts and emails to each other. They discuss everything from your children, the inlaws and I had a case where a man told his OW how he hated the scares from his wife's mastectomy and found them repulsive, but would tell her she was so beautiful.
That kind of thing would be unforgivable for me, but they share everything and nothing goes unsaid.
Ignoring isn't for your mental health at all.
He may still want her, but not want to leave you either. He may be happy to have the two of you. Only you know the content of the emails and how into each other they were.
I read the OW boards as well and so many of them are convinced the wife knows and says nothing. They just up their game hoping she will be the chosen one, but she usually isn't.