after you nearly avoid walking a girl he slept with down the aisle while filling in for him (sans tux) at his sister’s wedding rehearsal:

• The known known: an official ex; a former long-term significant other; someone everyone knows you were fucking, regardless of how ill-advised said fucking might have been.
• The unknown unknown: a one-night stand; someone your friends/family may have vaguely known existed but would never meet; someone you fooled around with for a limited amount of time knowing you would never see them again once the affair transpired.
• The known unknown: the person who is already a part of your life in another context, whom you enjoyed hooking up with for a period of time but not enough to change or disclose the nature of your relationship. The person I have to pretend I didn’t know you were fucking because I don’t know who else knows you were fucking. The person who reminds me there are some things I don’t know. The person who makes me remember why some wars are fucking doomed from the start.