What’s one thing you knew but never told anyone?

When my sister was dating my brother-in-law, she was sleeping two other guys. My brother-in-law went to school in the south, so he visited my sister whenever he can. While my brother-in-law was away, my sister was busy with two other guys. My brother-in-law was her 3rd option.

What’s one thing you knew but never told anyone?
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