Should I break up?

My boyfriend of 4 years just admitted to me that he cheated on me 3 years ago with his coworker... he said it only happened one time and he’s felt guilty ever since because he loves me and he says that love has only grown stronger since. Hearing that has made me feel like I can’t trust him... I know it was 3 years ago but it still hurts. Should I break up? 😢

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