I can’t even look at this without crying again

Okay, but this scene, Jensen’s acting in it just kills me.  A lesser actor would go over-the-top hammy with it, with all the “Big NOOOOOOOOs” and wailing and chest beating histrionics.  But here, we get a pure expression of rage followed by a crippling realization that isn’t over-the-top, but feels 100% real.  There’s something very primal about his rage, particularly when he throws the chair, that just gives this scene such power and pain.  And at the end, he conveys his realization of guilt not by having a breakdown, but in small and subtle, but emotionally powerful, facial expressions.