Stiles and Derek were together for a year, Stiles loved him, he thought Derek loved him, until he heard sex happening in Derek's bedroom and a girl screaming his name, then he entered to find a horrid sight of Derek cheating. They break up, leaving a sorry Derek. Stiles is comforted by surprisingly none other than Peter Hale, Derek gets a little angry... He couldn't believe it, it was like his heart shattered before his eyes... The sounds... The heartbreak... The sadness....