How do I expose the affair

[mb28]

I don't think I need to send the email, my friend basically told him what I was going to send him anyway:

H: There is no hope for us, I wish she would just let go
F: There is always hope, your A is hurting your family
H: There is NO A, we are just friends
F: Friendship or not, your hurting your family
H: Just friends, and I'm sick of everyone thinking I'm cheating and it's my W's fault for ruining my reputation. It's best if we just D.
F: I don't believe that is the answer
H: My W is obssessed with saving our M, and she is ruining her life in the process. Her work, school, everything is suffering because she thinks there is a chance
F: That is the most important thing to her right now.
H: It just needs to end, the wall I've built up will never come down, and she just keeps making the wall bigger
F: You wife would like to work on the M. However, this is hurting her to bad and she would like NC with you of any form until you end your A with this OW. If you need to contact about the kids, do it through me or your mom.
H: It's NOT an A. But I agree, it's best if we don't contact each other at all. I think I'm ready to file for D, it's the best way to end all this pain.
F: Sorry you feel that way, and this will hurt the whole family.