His gaze follows the fruit to his lips to his gaze. There's something off. It nags at his memory until -

"Your friend was looking for you."

Castiel. His brow furrows slightly. He thought Dean had been drowned by a beast in the ocean. Or, rather, he saw Dean get pulled under the water, but believed beyond hope that he was still alive. And, apparently is. He hasn't heard or seen of Castiel since - he must already know by now.