My boyfriend send screenshot of our whatsapp sexting to someone who has crush on me. Should I broke up with him or forgive him for this time?

My boyfriend send screenshot of our whatsapp sexting to someone who crush on me. My boyfriend knows that he has crush on me so he did it just boost his ego. It really makes me sad. It happened for the first time and I lost all my trust for my boyfriend. The guy who crush on me said what my boyfriend did. He said he's sorry and he won't bother me again. Also my boyfriend said he's sorry too. He apologized me for milion times. He promised that he won't do that again. Our relationship was perfect until this. What should I do? My one side is saying just dump him, my other side is saying ignore what happened for this time. If you were me, what would you do?
My boyfriend send screenshot of our whatsapp sexting to someone who has crush on me. Should I broke up with him or forgive him for this time?
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