Honestly, this was my first question while reading the summary (read the article? Bah!). It's possible that this person availed themselves of AshleyMadison sometime in the past and has since improved his relationship with his spouse; however, it sounds more like rationalization, as such improvement presumably precluded 'fessing up to his indiscretion.
Unfortunately(?), he relied on a third party to assist with the hook-up. Remember: Two people can keep a secret, so long as one of them is dead.