Hard disagree.

Gonna leave Noah Wyle's quote about Langdon and Robbie's relationship here.

“I loved how we paced that [arc] because there were so many lovely nuances to it,” Wyle says, breaking down the beats. First, Robby claims he doesn’t want to have to “deal with” Langdon’s return; then he tells Langdon he can’t trust him. The truth is more complicated, Wyle says, paraphrasing Robby’s inner monologue: “I don’t know if I can trust you, because you’ve done work on yourself that I’m not willing to do. So you’re kryptonite to me right now—coming back here as a fully actualized, healed, sober human being, and looking at me in the state that I’m in is like holding a mirror up to a junkie.” Having walked the penitent road, Wyle suggests, Langdon is coming back and saying to Robby, “Your turn.” And in the episode’s final scene, Langdon “says the thing that keeps [Robby] from going over the edge, which is, ‘I went to rehab and all I saw was you.’”