I know several people (myself being one) that would scream at you for tying a horse like that for even a second, he could step on it and snap his neck, even if you're right there, it only takes a second. YOU MISSED A MORTGAGE PAYMENT FOR A HORSE THAT MIGHT NOT EVEN MAKE IT!? Are you insane? That's irresponsible, like just dressageit said your family needs food and a place to live, I love horses but this one....he's in bad shape the poor thing is suffering and I agree with xlioness, it's safer and kinder for him to be PTS.
Equestrianism; 10% luck, 20% skill, 15% concentrated power of will, 5% pleasure, 50% pain and 100% reason to remember you're absolutely insane to be riding a beast that big.