The Three of Swords represents heartbreak, loss, and betrayal. Like being stabbed through the heart, the pain is sharp and often unexpected.
This card shows Kamui as his world shatters after his childhood sweetheart is murdered by his best friend, who says he will kill Kamui next. Worst of all, the events are the result of a decision he made for their benefit.
The second card is the original, less gruesome version -- I'm not always fond of CLAMP's blood and guts myself, but the new image was simply too perfect -- which shows Kamui clutching Kotori's head, a look of total shock in his eyes.