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Rachel only cheated on Finn with Puck to give him revenge for lying to her about Santana.
There is an episode on Glee called 'The Quarterback' which is a tribute episode towards Finn Hudson (Cory Montieth)
The Glee Episode In Which Finn Happens To Sing Jesse's Girl To Rachel Is Laryngitis
The Scientist by Coldplay is featured in The Break-Up, the fourth episode of Season Four. It is sung by Blaine, Brittany, Emma, Finn, Kurt, Rachel, Santana, and Will.
Season 1 episode 13 'Sectionals' is Where Santana says that line.
The episode is called "I Kissed A Girl"
season 3 episode 10
Episode 5 ' The Rhodes Not Taken'
Kurt, Mike, Quinn, Puck, Rachel, Santana, Mercades and Finn. :)
There will be a season 4 which has recently been comfirmed. We are not sure if Santana will still be there, but Kurt, Rachel and Finn will. :)
'Michael' season three episode 11
Finn proposes to Rachel at the end of "Michael."