What's right and what's wrong with infidelity?

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Long story short, Ex Cheated we had split & have no rekindled with the exception that he completely cut her (person he cheated on me with) off. Am I unreasonable for asking? And what am I doing wrong in this situation? And if I am doing something wrong, what the right things that I should be doing?
Whats right and whats wrong with infidelity?
Whats right and whats wrong with infidelity?
What's right and what's wrong with infidelity?
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