How you know you’re in love: Nico Lang
You can’t stop bringing them up in casual conversation, even to people who don’t know them or don’t know you, like random people on the train and the bus or the person at the stall next to you in the bathroom. They pop up in random conversations that didn’t even initially have anything to do with them, like a discussion on finally finding a two-diva solution to the Britney-Christina Crisis or exploring the existential gauntlet thrown in Dude, Where’s My Car?
You can picture this person’s face with your eyes closed and could draw it, sketch it or fingerpaint it without looking, and when you close your eyes and feel their face, you can tell that they look exactly how they feel. They ask you if you would still like them or date them if they murdered someone, started worshiping Satan, were incurably stricken with Bieber Fever or converted to Scientology, and you don’t hesitate to answer, although you mention you might initially have a hard time with that Bieber thing.