Why when im without her does my whole life seem to altar?

Why?
When I’m without her does my mind begin to falter?
Why?
When I’m without her does my whole life seem to altar?
Why?
Why when our lives are not combined do we get this feeling like being torn apart?
Why?
Well if we didn’t get these heart wrenching feelings,
And days have no end,
No start,
We would never appreciate each others feelings or when we see each other and how it kick starts our hearts.