Once a cheat always a cheat? What's everyone's opinion

While this may be true in some cases, the definition of cheating is subjective. Cheating once also does not mean that one would repeat it often or that it has something to do with the partner. Infidelity can occur anytime in a relationship but you must decide whether you want to continue going down that path or really understand the root cause of the problem and work on it in your relationship. To each his own.