Do people ever think before someone cheats that they could be a cheater?

Wubs3000

Like with my s/o I trust them a lot and I think they would never cheat. I couldn't imagine them doing something like that and its not at all true to their character. But I realized that people who got cheated on might have thought the same before they knew. So I'm asking:

People who have been cheated on, did you ever think that they would have the potential to cheat, or did you think that they would never do that?

Do people ever think before someone cheats that they could be a cheater?
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