I don’t work on being faithful because temptations become tempations only if you look for them. I work on my marriage in the way that I never take my spouse for granted. “Looking” elsewhere is neither an option for me nor a necessity.
So why do people cheat, and so much these days?
Because they think it’s OK: lack of integrity
Because they are never content with what they have
Because it’s easy: so many venues and available help