This happens after the IHY scene , jake comes back and try to win peyton's hart-, hart again rememebring their good times together! Blue/pink : past normal color : present
Lucas is dating Peyton and Brooke at the same time. They're in love with him and when he leaves they're crushed. In the end he comes back but nothing is the same..
So: Peyton has a choice (Lucas of Jake). She picks Jake and they are happy together. Lucas.. not so happy. Peyton doesn't want him and he's heartbroken.