Rachel plans a charity event for rescue animals on Glee. "Old Dog New Tricks" is the 19th episode of the show's fifth season.
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Blaine and Sam confer in this scene from Glee. It's courtesy of the episode "Bash."
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Glee Quotes

I'm gonna miss all of you. I love you guys.

Puck

Blaine: I needed you. I needed you around and you weren't there. And I was lonely. And I'm...I'm really sorry.
Kurt: You don't think that I've been lonely? You don't think that I've had temptations? But I didn't act on it because I knew what it meant. It meant something horrible and awful.