Why?

Just as the spring calls
and summer comes and goes
Just as the leaves fall
and it snows
One day love can make you feel so happy and great
And the next day so weak with painful weight and hate
Why did you act like we belonged together?
When really you changed your feelings for me so sudden like the weather
Why did I give you all my trust when you liked HER all along?
Why can't I get off my shaky knees and be strong?
Why can't I get you off my mind?
And even though a great guy likes me, you're the one I think and dream about all the time
Why?