Supernatural Season 6 Episode 6 (Supernatural s06e06) with title “You Can’t Handle the Truth” aired on Friday, October 29th 2010 at 09:00 pm via CW Network.
Here is summary for Supernatural Season 6 Episode 6 :

Sam and Dean investigate a series of suicides and discover the victims were being told brutal truths that drove them crazy. They find out someone is invoking the Goddess of Truth, Veritas, forcing people to be cruelly honest against their will and Dean is the next victim. Dean is forced to tell Sam the truth about how he feels about his return from Hell.