He repeated that ALL debt is bondage.
I would argue that he then disproved this point to you. By giving you this money, he changed at least a portion of your debt from one form to another. Now, instead of owing the Credit Card company that $2500, you now owe that debt to yourself in the form of honor and accountability. This man has given you a head start on the self-respect and freedom that comes with relieving your financial debts. You now owe it to yourself and to him to use that (and your own) money wisely. A debt like that is actually freedom I think.
Congratulations on your first steps, and let me tell you that when when you start to reach those goals, the feeling will be even greater than what you're feeling now. Somewhere down the road, when you are secure enough in your financial picture to help someone the way you've been helped, you'll be reminded that there are debts that money doesn't cover, and that you're more than happy to repay.