I [23F] bought my friend's [24M] music and he found out, now he's hurt

EDIT: Didn't expect this to get so much attention. A lot of people have asked for a link to his music, however I don't think he'd want me to 'advertise' him like that and I feel like it would actually make the problem worse. So I won't do that sorry. He's been in contact with a local label anyway so things are already looking good for him.
My best friend has been producing music for years, he's on a pretty high level production-wise for an amateur and is slowly gaining a following online. I genuinely like his music, it's in a Genre we both like a lot, and I always give my honest feedback about his newest tracks, which is usually pretty positive. He tends to be very self-critical but which artist isn't.
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So basically he set up a bandcamp account recently where people can download his music and can pay whatever they want for it. After a while, I had this idea that I want to buy his album so he feels better about his music, and also kinda because he doesn't have a lot of money. I paid about twice what you'd normally pay for a brand new music album which is absolutely no big deal for me financially.
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Well.. next time we saw each other he excitedly told me that someone paid for his album and by that point I had almost forgotten and just kinda went 'oh yeah oh ****' internally and tried to act nonchalant but I guess I failed. It must have been on my face because he immediately asked if it was me and I didn't want to lie in his face so I said yes. Now he's hurt because he thought this random stranger liked his music so much they paid a lot for it, and a friend doesn't count I guess. I totally understand his emotional reaction. I'm a genuine fan and only wanted to support him, but basically he doesn't want alms.
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He didn't really get mad over it, but I could tell from his face that it actually hurt him a lot and now I feel awkward about it. Should I just never mention it again, or apologize in detail or something?
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**tl,dr:** Friend thought a new fan had bought his music, but it was me. He feels like I only did it because we're friends and is hurt. What do I do?


Source.