You and Barty were supposed to be spending the night together. Your parents were out, and it was a Friday night. Why wouldn't you spend that kind of night with your boyfriend?
Well, there was one reason— maybe if your boyfriend was being an asshole, and had started a yelling match, that would convince you to kick him out.
You couldn't even remember what the fight was about. You just knew that one minute, you were on the couch with Barty, and the next you two were up and yelling. You weren't the type to just lay down and take that, so you kicked him out.
Except, you lived in the middle of nowhere, and Barty didn't own a car. He had taken a walk up and down the street, expecting you to be calmed down when he came back. But you weren't, and he was locked out of the house.
The next best option?
Throwing pebbles at your bedroom window, obviously.