A song on the piano admitting love to a girl best friend [read the details please]?

Hello! I am writing a story about this odd couple who live in a duplex building. The main male character is Schuyler Hastings, a highly intelligent yet completely socially backward twenty four year old who doesn't show any hint that he could even be sexually interested in anybody. He acts robotic in emotions. People assume that it's because he's socially backward and in a way it is somewhat but the main reason is because he walled himself up because he was viciously beaten as a child. Nobody really knows this though. He meets a girl, twenty one year old Lily Grey, who has a past that nobody really knows because she never really talks about it. Lily and Schuyler are literally at each others throat and are constantly matching wits and fighting and pranking each other ruthlessly. Somewhere along the lines of all the fighting though, Lily falls for Schuyler. He never realizes it. Schuyler fell for her as well but he doesn't realize that either. One night she has to pick him up from work and she's late because there's an accident on the highway and traffic wsa backed up. She finds him in a dark auditorium, playing the piano with his eyes closed. Yada yada yada, some stuff happens and she admits her love for him while laying on top of the piano as he plays. His fingers falter over the keys and they are silent for a bit before he plays her a song and starts to sing it quietly. The song is him telling her that he fell for her too and loves her back. What song would be perfect here? I can't think of anything =/