You can't change the past or the choices you made. I know its frustrating. You can now use this regret to make different choices for a happier and healthier future.

Let him keep his chair, even if he's lying about using it and suffering with having it. This situation is why schadenfreude exists. You get a little pleasure knowing he may be suffering because of a chair or satisfaction in his stupidity for keeping an expensive chair and having cash flow problems. I guarantee he's glad you are having trouble. The best revenge is succeeding anyway, without him.

I know its difficult and scary right now and I know you don't want to change your lifestyle. The reality is you are doing things that may cause you harm in the future. (lying on a resume could be considered fraud and living an expensive lifestyle may keep you from having financial security). I'm not saying this to upset or hurt you, just to give you a different perspective. Ultimately, you need to make the best choices for you. If you regret some choices in the past, the only way to prevent future regrets is to see consequences of the choices you are making now.

I hope for the best for you.