I'm interested to see how everyone would act/react?

I used to be in a relationship where my ex used to say mean. things to my good friend. Like she was fat or ugly. He never wanted to talk to her or anything. She also never wanted to talk to him. After my ex and I broke up, I learned that the two of them ended up hooking up right after our breakup. How would you feel/react if you were in my shoes?
I'm interested to see how everyone would act/react?
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