Chance can go to any extent to have what he longs for and he would clearly say No if he is not interested in anything.
He was shocked when Carol confessed her love for him. With a heavy heart, he rejected her as she was someone who meant the world to Lucas and Chance made a promise to him that he would never let her be unhappy but he himself was the reason behind her sadness and broken heart which made him feel guilty.
But again, Chance was not someone who would accept her love for the sake of keeping her happy as he knows in the long run, he won't be truthful to her and in-turn she too would be upset in life.
So, he decided, in the matters of heart, it was better to be honest, no matter how painful it is for the other person as no one deserves to be in a loveless relationship.
But this time it seemed Chance's words hit Carol harder than he expected, maybe it was due to Samantha's presence, he thought.