He was disappointed in her and she was disappointed in herself. For hurting everyone because she was an idiot. And Elena knew she wasn't the only one who saw herself that way.
But if Stefan had been aiming to hurt her, the words were a direct hit. Elena couldn't tamp down on the emotion which welled within her. Instead she just nodded, gaze darting up to him for a moment before lowering, trying not to let him see any tears.
She swallowed hard, trying to get rid of the large lump in her throat. "Because I'm a horrible person." She couldn't do this anymore, everything suddenly all too much. Turning to go, she paused a moment.
"I'm sorry, Stefan. For everything." And unless he had something else to say, she would just go back to her empty apartment and wallow in self-pity and guilt.