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So yes, I would judge, to answer your question.
Is it wrong to believe cheater is always a cheater?
I don’t think so. If someone has cheated once, twice, or however many times, the potential of always there for them to cheat again. Like that saying about when a mistress takes the main slot, a vacancy is created.
Why are they trash if they are actually happier with each other?
cheating and lying to the partner? since "taken someone else's man" implies such went on rather than a break up and getting together later.