Since the beginning of time practically, you and Nancy Wheeler have been best friends. There was even one summer where you saw each other every single day. Your best and worst memories have each other present in them. There’s no one you guys trust more than each other which means you also understand each other better than anyone else.
So when you start acting odd and not hanging out with Nancy as much as usual, she notices. Even if you can trick everyone else, you can’t trick her. So Nancy starts to pay closer attention and speculate more.
Tonight was a big night because Nancy was finally going to figure out what is up with you. She accompanies you to Steve Harrington’s small house party and loses you from there. Awkwardly she searches the humungous house for you, surrounded by wasted teenagers.
Finally, she finds you. And her answer.
Making out with Steve Harrington himself is you - her best friend who she has always secretly been in love with. The two of you quickly pull away and stare at Nancy in shock.