<P> Santana Lopez (Naya Rivera) visits her girlfriend, Brittany Pierce (Heather Morris), and learns that she joined a club created by cheerleader Kitty Wilde (Becca Tobin) to prepare for the rapture . Kitty's boyfriend, Jake Puckerman (Jacob Artist), invites Marley Rose (Melissa Benoist) to one of the meetings, but becomes disappointed when Kitty uses it to play a harmful prank on one of the members . Jake eventually decides to break up with Kitty after she mistreats Marley, but also ignores Marley's romantic advances . </P> <P> Santana serenades Brittany with Taylor Swift's "Mine" and confides with Brittany that their relationship isn't working due to the long distance and her new priorities . She and Brittany break up, which leaves Brittany devastated . Blaine continuously attempts to contact Kurt, but Kurt won't communicate with him, and he becomes uncertain of where they're standing . </P> <P> Rachel, having flown all the way to Lima, confronts Finn at the McKinley auditorium, where she calls him immature and a coward for hiding from her for months . She says she loves him, but states that she can't keep their current relationship up, and she breaks up with him despite Finn's claims that he was giving her freedom . She gives him a last kiss, and leaves . After she leaves, Finn performs Coldplay's "The Scientist" alone, and imagines that Rachel, Kurt, Blaine, Santana, Brittany, Will and Emma are there performing with him . </P> <P> In a July 2012 interview with E! News, Colfer elaborated in regard to the progression of the Kurt - Blaine relationship in the show's fourth season . Colfer said, "I would like to do something besides say' I love you,' and I think Darren (Criss) and I agree on that . We're ready for the next step . They've been together for a while . Let's throw some spice and drama into that ." Colfer quipped that he did not know what was in store for the couple, "I hear mixed things . I hear they're still together but then maybe they're breaking up ." In a September 2012 interview with the same publication, on whether the couple would break up or not in the show's fourth season, Criss stated, "I don't know . We still have episodes to shoot ." Criss ultimately echoed Colfer's sentiment, "We're like an old married couple now . Let's shake it up!" Prior to the episode's debut, series co-creator Ryan Murphy dubbed it "the best episode we have ever done". </P>

When did they sing the scientist on glee
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