Lamorak is, in the best tradition of messy breakups, making his way to the kitchens with the intention of getting roaring drunk. He's sober for now, though, and might actually welcome some company, depending on who it is.
Lamorak is wandering through the gardens, singing. His voice is pleasant, but very clearly untrained: this does not seem to effect either his volume or his enthusiasm. Crackplot is, of course, to blame but Lamorak has no idea.
She probably already knows. He knows this. She'll be angry, he further knows. But none of this changes the fact that he has to go and tell her. So he does. Because it is, on some level, the right thing to do.