Am I crazy to allow my boyfriend to cheat on me?

My boyfriend asked if he could be with another girl I told him I was cool with that. He asked me if it was technically cheating and I told him yes and I told him before the cheating was a deal breaker to me and yet in this entire time that I said yes he said nothing so I don't know why I did wrong.

Am I crazy to allow my boyfriend to cheat on me?
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