I don't know why

I don’t know why,
When I look at the sky,
Why it’s so blue.

I don’t know why,
When you walk by,
How I like you.

I don’t know why,
When you say ‘Hi’,
You don’t like me too.

I don’t know why,
Though I try,
I can’t forget you.

I don’t know why,
You make me cry,
But you do.

But I do know why,
And yes, I sigh,
It’s because I love you.