Perfect response.
I am always astonished that people don't get the reality that being a cheater equates to having a low character. If they can look at a person they have promised to love and cherish, a person who shares their life and their home and lie straight to their face every day, they will lie to anyone else and about anything else at all, without blinking.
All cheaters are untrustworthy, over entitled arseholes, every last one of them (assuming they are in the relationship through mutal consent and have agreed to be monogamous). As for those who turn a blind eye - lie down with dogs, get up with fleas.
Apparently they're both married. So they both wanted to cheat and chose to cheat, that's the "reason". I hope their families blast them both into the stratosphere, poor souls.