On the ark, you and Bellamy were best friends, always together everywhere. The truth is that you were in love with each other but never had the courage to say it.
But on that fateful day, everything changed. Octavia was discovered and arrested, Bellamy lost his position, their mother was floated and you were arrested for being an accomplice. You and Bellamy were never the same, he blamed you for everything that happened, since you were the only one who knew about Octávia, he always thought it was you who told Kane. But you would never do that, you would never do anything to hurt him.
Now, the three of you were on earth together with the other delinquents, Bellamy was their leader. He wasn't the same anymore, he was colder, heartless, only caring about his sister. He avoided you all the time, he didn't even look you in the face, when he spoke to you, they were in short sentences, he was rude and he was always irritated, never giving you a chance to explain. But destiny seemed to like you, since because of the acid fog, you had to hide in a cave, coincidentally, it was just you and him trapped there, for hours.