Oh, I know you feel hopeless. It's the worst feeling.
Do not make any rash decisions right now. Give yourself time.
Have you asked him if he is having an A? What you can say is that you are concerned and you want your marriage to work. Also point out to him that it can't work if he is having an A and you don't want to compete. Plant that seed. Don't cry, plead, threaten or anything of that nature.
It's going to be important that you look safe and sane to him.
The stats on As are that 4% of them last. Then I think out of those 4% who actually marry, 50% of those marriages end in divorce. It's not very promising. NOTHING that starts in deceit can really last. Keep in mind that if he is having an A that it's not a real deal.
Do you have an idea if there is OW?
M 55 H 58 M 24 T 29 S 22,21, 19 Bomb 4/10 It (A) really isn't about you 11/2013 We all have work to do
The truth will set you free, but it will almost kill you first.