Repeat

I've felt this once before -
Where simply breathing was a chore;
Where I couldn't figure what to do,
And couldn't find words to say what I thought;
Where whenever I laid eyes upon you,
It felt as if my heart would stop -
But it keeps beating, beating, beating,
And just your smile's eating, eating, eating
My soul out.

Without a doubt,
I've felt this once back then -
Why must you make me feel again?