In your opinion, what is the most unforgivable mistake that makes you not wanting to give a second chance to your ex?

Let's say you and your ex broke up for whatever mess he or she has made. Then your ex wanted a second chance, what kind of mistake is tolerable for you to forgive and what is not?
In your opinion, what is the most unforgivable mistake that makes you not wanting to give a second chance to your ex?
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