It was a month after the giant war. Percy was packing up his bags to leave Camp Half-Blood, forever. You might be thinking, why? Here's why.
-Begin Flashback-
A week ago, a new camper was running up Half-Blood Hill. Suddenly, the minotaur appeared behind him. The camper promptly fainted. Percy yelled, "Hey, meathead! Over here!" Percy killed the minotaur. The new camper got up and wrenched Percy's sword from him and bragged, "I defeated the minotaur while this guy fainted!" Percy said, "That's not what happened!" But no one, not even Chiron, who was like a second father to him, believed him. To add salt to the wound, the camper was claimed as a son of Poseidon. His name was Paris Hilton.
After, everyone was smitten with Paris and called him the new Hero of Olympus. Percy thought, "At least I still have Annabeth,". He got the ring ready and put the box in his pocket. You see, he was going to propose at the campfire. When he got there, he saw Paris kissing someone. "Probably an Aphrodite girl," he thought. He looked closer and saw that it was Annabeth. His heart shattered into a million pieces. "Annabeth?" he croaked out. They broke apart. Annabeth started to reply, but Percy cut her off. "Why?" he said, all his anguish in that one word. "Percy, I-" "Forget it," he told her. He took the ring out. Everyone gasped. He was going to propose to her and she repaid him by cheating on him. He threw the ring on the ground and left. What was worse, after a few days Poseidon disowned him and accused him of killing his mother and step-father.
-End Flashback-
He packed his bag and left Camp Half-Hell, never to return again.