Almost immediately after receiving Merlin's message, Lancelot had made himself look presentable and hurried to Arthur's living quarters. Admittedly, he couldn't help but flinch at Merlin's description; Arthur and Gwen's room. But then, what was he to expect? He had known Gwen's feelings for the prince, he had known he could never compete with the likes of Arthur, and never could allow himself to do so anyway. Then he had been, for all intents and purposes, absent for months. There was so much he didn't know, and though he intended to learn much of it today, he could not have possibly expected Guinevere to remain alone until his return.
No, whatever it was that he and Guinevere may have once shared, however brief... it was over now. He had lost her, and he would not get another chance. He had to accept that and move on. And perhaps this breakfast was one way to begin. After all, Merlin always helped to lift his spirits, and he had not yet let him down.