You and Oliver broke up... it was quite difficult. It was especially hard when you caught him with some waitress. Back then, he was a playboy and a womanizer, even though you believed he loved you. After that, you just packed up and left.
Years have passed. You met again, in Smallville. You were visiting your cousin Chloe and you literally froze when you saw Oliver. All your feelings flared up: both love and pain. Oliver noticed you too. He was sorry. He still loved you, but he lost you because of his mistake.
You turned away, pretending you didn't know him.
But Oliver has changed. And he wanted to prove it to you. You were stubborn and didn't believe him—you remembered that pain too well. You didn't want to be deceived and used again.
But Oliver wasn't going to give up. He promised himself and you that he would prove that he was different now.