Alive but dead

One minute you exist
And the other you don’t
Sometimes your love is overwhelming
And suddenly you don’t even care
You show me peaks of ecstasy
You smash me down to bitter reality
I don’t know what I mean to you
But I thought you’re different
I don’t know what you’re going through
A part of me is always on your side
Maybe you don’t like me
I’m not ready to believe it even if it’s true