Achilles heels

When is someone most vulnerable?
Why did the full-time alert man suddenly became so careless?
My guard got down
Proven the trust for you
Yet why do you have to hurt me again and again?
And why is every wound worse than the one before?
It is like breaking someone’s soul again and again
Maybe till one day I will cease existing
And finally become not shattered pieces but vanished pieces

But still, I never regretted anything I hoped for
Is it because this is as the legend?
The legend that one can only truly love once
And if failed he will live on as only a body without its soul?