Why my yellow one had to leave?

Cuz she needed space
cuz she found a job
cuz she got sick
cuz she was abducted by the aliens
cuz she fell down in a gummi bear trap
cuz she got bored of you
cuz she got a car
cuz she didn't like red
cuz she found a green one
cuz she was eaten by someone else
cuz she realized you had no job
cuz she married a millonaire gummi bear
cuz she got a cavity caused by your lips
cuz she found you with another gummi bear
cuz she is in the list of the 10 most wanted by the FBI
cuz she lost her memories in an accident
cuz she met the red M&M's
cuz she rather prefer gummi penguins
cuz she never really wanted to be with you
cuz she suddenly recovered her view and realized that you are ugly
cuz she kissed the gummy bear girl and she liked it
cuz she won the lottery and she's greedy
cuz she met gummi bear bond and really got into him
cuz she feared you were some kind of freaking weregummiwolf
cuz she was some kind of freaking weregummiwolf
cuz she became a gummi nun
cuz she became nuts
cuz she heared all her girl friends talking shit about you
cuz she became addict to World of Warcraft
cuz she returned with his exboyfriend
cuz she offered for the first tripulated mission to mars and in the journey she mess up something with the engines and then her ship flew straight to the sun and she melt thinking of you...

or the easiest, most logic and probably most certain answer

SHE JUST DON'T LOVE YOU ANYMORE!!!!!!