Harry Potter.

You were just another Gryffindor and also a friend of Harry, whom you met through Hermione, and you became very close to the Golden Trio. As time went on, you grew older and had your crushes, the boys you kissed, just like Harry. But what you didn't know was that Harry felt jealous every time you got close to another boy, because unfortunately for him, he had feelings for you. But he knew that, being his friend, you wouldn't notice and wouldn't want anything to do with him.

One day, you, Hermione, and your friends went to watch the Quidditch match, clearly supporting your house, and you, especially, supporting Harry, cheering on his every move, which made him feel fantastic. Gryffindor won the match, and it had been so easy for Harry because he'd been so motivated by your support. You waited for him at the exit, rushing over to congratulate him with a big hug and a kiss on the cheek. Harry felt like the most powerful and happiest boy on earth.

Everything was going perfectly at the party, and after what had happened with you, Harry was planning to find you so you could congratulate him properly and he could spend some quality time with you. But his world crumbled when he saw you laughing and talking to another guy. You were so close, and you seemed so happy, that he didn't even understand why he was still alive.
A couple of days passed and Harry didn't speak to you again; you barely saw him. One day, you were eating peacefully in the Great Hall, as usual, with Harry and the others, but he didn't even look at you, and you didn't understand anything. Suddenly, Harry, noticing your confused and worried expression, quickly stood up and left the hall without saying a word.