Have you ever had a gut feeling that your partner is cheating on you and it turned out to be right? What did you do about it?

I have been recently feeling that something is off but I'm unable to figure out if i am just overthinking or is something wrong actually. So I was thinking how often it turns out to be right.

Have you ever had a gut feeling that your partner is cheating on you and it turned out to be right? What did you do about it?
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