Board Thread:Legitimate Canon Questions/@comment-27851096-20160223021535/@comment-4091815-20160223032250

Their relationship "sort of" ended in episode 510. Stiles was in the throws of his "Oh my God I killed somebody" guilt and Malia was in her whole "Oh my God I want to kill somebody (Desert Wolf)" thing.

Wheb they just stopped communicating, they fell apart. They're still broken up but have managed to work together when necessary.