One day to ruin a thousand before

One day, oh, wait, one hour only
And all was ruined, all we slowly
Were building balancing on a rope
Under the steep cliff of love
One day I know what did I do
I have only stood to what I knew
I didn't think about what you feel
Hurting us both like it wasn't real
One day, believe, I have lost more
Than what I fight, was living for
I've lost myself and what was found
Is not what I want to be around
Deep cave in the heart won't heal
New day won't bring happiness clear
But I say sorry with the last I have
If I have some on my soul's shelve
Don't know if I do, don't know if must
Don't know how long will it last
One day and, no, it was not hard
What's hard is to give it a new start