If you caught your platonic friend of the opposite sex in bed with your clone, would you be upset?

Let's say you encounter an identical clone of yourself. You and the clone become best friends, but one day, you find the clone in bed with your platonic friend, whom you see as a sibling. How would you feel about the situation?

If you caught your platonic friend of the opposite sex in bed with your clone, would you be upset?
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