SpongeBobSquarePants Question Please Help?

ok does anyone know what is the episode called where Gary leaves SpongeBob SpongeBob and Patrick for is all sad and replaces it with a half shell and is gary just wanted the cookie in the back pocket Patricks can u please tell me the episode name? Am thats really looking for the instrumental song played every time I get sad SpongeBob so if u know the name of the song would be much better if you could help not be able to find the name of the episode thanks in advance

Dumped: Gary seems to like it better than SpongeBob, Patrick, so SpongeBob becomes jealous and buy other pets to Gary back.

Poker Face by Lady Gaga parody – Spongebob Squarepants