Heres the picture of Three-tail and the curse:

*******

Three-tail:
You may know I'm a guardian... watching over a certain person due the time that this person needs me. I'm always there for you, protect you, save you from everything...
But when the time comes that you finally found a safe place, I will go away.
I will lie down on a lonely place, fainting away and dieing a painfull death.
you won't ever know... because you are safe now and don't care about me anymore...
This is my course... my destiny.
Untill the day that the one I was watching over for so long, follows me... cares about me...


this is the course of Three-tail. He's my one and only... when he dies, he will become a tiny stone-statue and he will wait for the next person wich needs help to rebirth once again.
I don't know how old Three-tail is. Maybe he suffers that course for thousends of years.
Once, a long time ago, Three-tail was, like all other 'nine foxdemons' feared and hated by the people. He was like the other 8 of his pack and he didn't mind to kill.
but then, he met a little boy... that boy couldn't speak but he had a big trust into Three-tail, wich never understood why...
The first time in his live, Three-tail had a friend. And he began to love that boy...
But the other eight Fox-demons didn't wanted him to feel mercy to such a pitiful human... so the desidet to kill him.
Three-tail tried his best, he fought every single fox... but Nine-tail defeted him and killed the boy in front of Three-tail.
At this moment... when the innocent blood of that young child touched the ground... the goddes of punishment apeared.
And she forced the foxes to become guardians, forced to protect the lifes they always took before.
And they all have gotten one course for each.
Three-tail had the worst...
"you, who wasn't strong enough to protect this child, will suffer a painful death over and over again. your body shall become stone and your death shall be only sleep, 'till the next one comes, that need your help. You shall be undefetable. No matter how deep your wounds are, you shall live, untill you're not longer needet. When this moment comes, you shall die again in lonelyness, so this course shall hold on for ever. Only when you find a true friend... only when you will find true love, this course shall be broken and your life shall be imortal."
Then he died... and his body turned to a small statue made of stone.
Every one of the nine fox-demons has an own meaning..
for example, One-tail is 'streangh', Two-tail is 'kindness' and Three-tail 'Love'. His destiny is to sacrifice himself for the one that he loves....

*****
He already found someone =) Trollhand... maybe HE will be able to break Three-tails curse?