Is there anything you consider absolutely unforgivable?

unforgivable? Most people are divided into two categories, the ones that thing everything is destiny and the ones that think life is a series of random occurrences.
Someone’s answer to this question will probably depend on their life experiences, for instance, if they’ve been cheated on and now consider that unforgivable. Some people can forgive anything, others are pretty tough and may have a low threshold for certain behaviors.
Is there anything you consider absolutely unforgivable?
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