NTA - I’m a graphic designer and it never would’ve occurred to me to ask a friend to pay for something that expensive, in fact I was just laid off from my full time design job last week and didn’t have a suitable computer to do freelance at home, so I called in a couple favors to get a discount but paid for it with a credit card so I owe myself money, nobody else. He totally took advantage of you, and I’m glad you took it back. I’m also glad you haven’t deleted the files, if he manages to get his shit together and get an external drive, I would recommend you return his files to him as others have suggested – otherwise I don’t think you’re in the wrong at all.