My caregiver who is married told me the other day EVERYONE cheats. Like it's no big deal. Is it true that EVERYONE cheats?

She's the helper lady that was taking my boyfriend away from me (just before he died). Her husband is disabled and stays home but he's always accusing her of cheating on him and she lies and says she isn't. Which one is it with her?
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The more I think about what she did to my relationship I had with my boyfriend before she came along makes me physically want to hurt her. She sits in my living room telling me how everyone cheats these days. Well, I am from the old days and that's why I want to hurt the witch. I don't like cheater's and I don't like liars! She is pond scum!
My caregiver who is married told me the other day EVERYONE cheats. Like it's no big deal. Is it true that EVERYONE cheats?
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