This is... vastly less dumb than I expected from the description. It's really quite decent! Also, somehow 80's fashion drawn with a modern art style works really quite well.
Also, how do y'all not understand the slap? Something that she considered special, and something she thought was special to them together, is suddenly being shared out with some other person (without her involvement, and that other person being someone she's already sort of jealous of). I remember how I thought in high school, and I would have had an identical emotional reaction - maybe not with a slap, but the same worried and upset feelings. And I'm a dude.