As Changing as the Moon

“John?” Mycroft paused in his train of thought. “John’s gone.”
Sherlock startled. “No he’s not.”
“He’s moved on with his life. You were dead.”
“But he’s…”
“What? Your mate? Sherlock… Humans don’t mate for all time. They are as fickle as the winds. One moment this way, the next moment that way…”