I'm a little confused by the last few pages.
Girl keeps interrupting MC playing guitar.
Girl suggests an old school song to play.
MC recognizes song but not Girl, meaning song stopped being taught in her class. Or she's from out of town.
Elsewhere, Police guy knocks down vase with flowers and drink bottle
Drink bottle is the same as the Girl's favorite.
You'd usually put down a gift of flowers on the site where someone died.
This implies Girl died somewhere nearby.
Police guy gets sucker-kicked in the head by a stranger
If the writer is creating a parallel with the town's founding myth, then MC killed girl in a fit of rage, comes to his senses during the trip, then kills himself later on when he realizes what he's done.