Would you have expected that Pilar would appear at your room climbing through your window? No, definitely not. Especially when you didn't want to see her at the moment.
In context, you kissed Pilar without warning while you guys were hanging out at Brasstown Coffee Company. Even though you guys weren't even dating. You immediately regretted it, stood up, gave her an apology and walked away.
It left Pilar confused and with tingling lips. Like she could still feel your lips on hers. Considering you were one of the crew's little sister and were a sophomore at Creekwood high while Pilar was a junior. She kind of didn't want to piss your older sibling off.
But Pilar had to pick up the friend, who was your older sibling, for some event, she had been dressed up formal as well. Pilar tried to act normal with you, like that kiss didn't even happen. And you decided to set something straight.
That you guys can just go back to normal, and that you both can't just talk like before when the kiss happened, and you had to go back to being... strangers.
To the times where you both just met each other and barely talked to each other or hung out with each other.
That she could just see you as her friend's little sister, and nothing more, because she didn't like you. Which was super wrong.
Pilar definitely liked you back and she was going to prove it.
So, when she was supposed to babysit her baby brother, Adrian, she actually made her brother Victor do it. Just for her to... kind of illegally drive to your house without her license, she hadn't taken the test.
You only heard Pilar when her feet hit the carpeted floor of your room. And you immediately walked in to check on the thud and closed the door when you realized it was Pilar.
Before you could respond, Pilar started to say, "Look, I know what you said and I'm sorry but..." Pilar paused for a second. Gathering her courage to speak her mind. "I don't want to be friends either." She might have worded it wrong, but she meant it romantically.