What to do when someone has betrayed your trust and made you feel dumb and shamefull?

How do you get over this feeling of being betrayed, being a loser and being dumb?
Should we go to get revenge or just let it go, learn from it, try to forgive and forget and move on?
How to shake off this feeling?
What to do when someone has betrayed your trust and made you feel dumb and shamefull?
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