My mother brought up a point that I cannot, with any amount of dedication or effort, compensate for. Eventually, we will have neighbors upstairs, directly above my ceiling. If they complain about the bird, my landlord will have to tell me to either get rid of him or move out (alternatively, she could tell me to make him be quiet, but we all know that's not something you can do with a bird, let alone a cockatoo) - and I cannot afford to move out, and my family cannot afford to lose my income.
As sad as it is, I cannot take that risk and bring this bird home only to have him feel abandoned another time. It wouldn't be fair to him.
Since I cannot take that chance, the best I can do is hope for the best and potentially call up the store to ask how he's doing and if he's found a home yet.
I hope for the perfect home to find him. And I regret that I cannot provide that for him without the notable risk that it would be ripped away from him. If I can, I'll try to go down and donate some toys or treats for him to hopefully perk up his mood at least a little bit.
This kind of maturity at your age tells me that you may indeed someday be a good fit for a hyper-emotional (to the point of self destructive) and hormonal (to the point of dangerous) wild creature with a knif/pliers combo for a face and an ability to respond, remember and resent that will absolutely blow your mind.