Your friend is acting like a leech and it is not okay. Any one that says they will pay you back or makes financial promises they don't keep is not someone you can have a helthy relationship with while your financials are still intertwined. I think you should take a step back from the friendship, but don't burn the bridge entirely. Explain to your friend that you feel as though they have placed an unfair burden on you, and now thay they have the means to make things right (sell the tv) he needs to do so if he values the sacrifices you have made to help him. Give him some time to make things right, but if 6 months (or how ever long you want) pass and your friend is still making empty promises and being selfish, then burn the bridge. Money always maked relationships complicated and harder than they need to be, and anyone who doesnt consider you important enough to help take the financial burden, they caused, off of you, is not worth keeping around.