It's been awhile since Stiles has been as nervous as he is right now. His palms are sweating as he makes his way down the hallway of the second floor, pausing outside of 217 and closing his eyes. He rubs his hands over his jeans a few times, forcing himself to take a deep breath. He raises his hand to knock on the door, then lowers it, leaning his head against the wall instead.
He's not sure he can do this.
Even though Scott is talking to him, even though they'd hugged and cried, he knows that it's no guarantee that Lydia will accept him back. He knows he doesn't deserve to be accepted back. It's different with Scott -- their history is a lot more in depth, a long longer in time span than his friendship with Lydia Martin. But he owes it to her to at least try to explain. To apologize.
He's also freaking terrified. He finally manages to lift his hand and knock on the door, holding his breath as he waits for her to open the door.