Finn: Kurt - Since they were stepbrothers, Kurt was always around when you were at Finn's house, and that quickly blossomed into an amazing friendship.
Puck: Brittany - Since she has dated her fair share of footballer's, you became really close as Puck was on the football team. Brittany used to feel really torn because for the first two years of Glee, Santana was really jealous of you, and it put Brittany in an awkward position but they soon got together and Santana wasn't bothered anymore.
Blaine: Rachel - You seemed to be the only other glee girl that could handle Rachel's diva-ish ways, because you were somewhat used to it dating Blaine.
Mason: Madison - You got close to her because she and Mason were so close.
Artie: Marley - You both felt somewhat victimised by Kitty so you banded together.
Sam: Tina - Once the class of 2012 graduated, and you were with Sam, you found yourself hanging out with Blaine and Tina a lot more and it just seemed to happen naturally.