You are...

My weakness and my strong point...
That's what you are
You can make me cry with only a word
You can make me smile with only a smile
You can give me shivers with only a caress
You can get me up
But you can also make me fall
You can save me
But you can also be the reason for which one, I would be able to fall
With you I touched the sky
And without you,I can see the sky falling