GLEE KLAINE DYNAMIC DUETS SPOILER ALERT!!
The scene before the flashback to Blaine and the random guy is of Blaine at his locker, taking down pictures of him and Kurt. Sam and him have a conversation where Sam points out Blaine has been beating himself up for weeks, ever since he and Kurt broke up. Then a flashback occurs of what happened. Blaine tells Sam he cheated on the person he loves most in the world, and he also mentions he’s tried talking to Kurt, but Kurt isn’t speaking to him.