Why her

When we first met you were everything to me
we used to go on walks and swinging on swings
i use to feel the sun and you were my number one
we attended school together remember Rapid Run
until one day everything changed
you suddenly started to walk away
than i noticed there was a girl
she was taking over my world
and than i had finally seen
u were giving her what you gave me
and to this day i have to ask
why on earth didn't we last
why did you choose her