I know, I don't know, I never know..

I know this thing is going to happen.
I know that you'll have to choose, someday.
I know that love doesn't work this way.

I don't know if it's going to happen this fast.
I don't know if you're going to be here forever.
I don't know if you're going to be around.

I never know that it's going to be so tough for me.
I never know that this is going to be too painful.
I never know that you'll care this much.
I never know that I'll love you this much.