Do I have the right to be upset? My ex girlfriend and cousin had sex?

My ex and I dated for like 8 months. Stuff fell apart we would argue over dumb stuff. I’ve moved on and doing some online dating.

I found out my cousin slept with my ex girlfriend I learned through the grapevine. Wtf do I do and how should I feel?

Do I have the right to be upset that my first cousin boned my ex gf? Who should I be upset at?

Thanks
Do I have the right to be upset? My ex girlfriend and cousin had sex?
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