3rd Person P.O.V.
Percy walked down the beach to where he was planning on meeting Annabeth tonight. He held the small velvet box tightly in his hand. It contained the ring he was going to propose to Annabeth with. He smiled imagining her smiling face, beautiful gray eyes and curled hair. He looked further down the beach and saw a couple kissing. The girl had blond hair like Annabeth. The boy had messy brown hair. The girl giggled. "Oh Mark! Don't worry! I'm dumping Percy tonight. You're the new hero!" She said. Percy stopped and stared at them.
Mark was the new camper who had arrived today. He was fighting off the Minotaur when he came. Mark was about to die but Percy threw his sword and it landed the Minotaur straight in the chest. He disintegrated in golden dust but everyone thought that Mark had killed it. Not him. His father, Poseidon, appeared after that and proclaimed Mark his son, and favorite one.
Percy took to a stride and stopped a few feet away from the couple making out. It was Mark and Annabeth, Percy's Annabeth. The waves crashed hard onto the shore, mirroring his emotions. They stopped and looked around. Their eyes landed on Percy. A single tear of anger, sadness and betrayal fell from Percy's eye. Annabeth jumped to her feet and took a step towards Percy, who shook his head and took a step away. "How could you?" His voice was barely a whisper. Tears formed in Annabeth's eyes. "Percy, I-" He dropped the box and turned away. "No. I don't care what your excuse is now. I loved you. I was going to propose to you. You were my best friend." Percy's voice turned cold. "How could you?" Tears were running from Annabeth's eyes. The waves crashed harshly onto the shore. He walked away and broke into a run to the Poseidon cabin. He grabbed his backpack and stuffed some clothes and hid his sword, Riptide, under his mattress. He threw his backpack over his shoulder and walked to Thalia's pine tree. A few campers watched him walk away in confusion. Percy's cheeks were pink from tearstains. Nico came running up to him with a worried expression just as Percy was about to cross the border and leave camp. "Dude, you okay? Where are you going?" Nico asks with concern. Percy continues to walk. "She cheated on me. With my half-brother." He says shakily. "You'll always be a brother to me, Nico. Remember that." He says and walks out of the camps border. Nico stands there with a stern look on his face of pure determination and a slight anger at Annabeth. He turns and breaks into a run to the big house.