Because he cares about you, and I'm sure in his current state he doesn't think anything that's part of him has any real value. His words, his companionship, whatever. So he thinks "oh, if I can't be a good thing for Felix, I can give Felix good things". It makes perfect sense if you hate yourself.
That said, though, obviously even people who aren't a total mess like giving presents to the people they care about, so it probably genuinely makes him happy, too. I'd let him keep doing it. But maybe let him know you like being with him, too. That it's not just the material stuff that's important or worthwhile. Not that it'd be easy for you to do, I know, but I'd bet a not insignificant amount of money it'd do him good to hear something like that from one of his best friends. I'd do it, but he doesn't care what I think any more than you do.
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That said, though, obviously even people who aren't a total mess like giving presents to the people they care about, so it probably genuinely makes him happy, too. I'd let him keep doing it. But maybe let him know you like being with him, too. That it's not just the material stuff that's important or worthwhile. Not that it'd be easy for you to do, I know, but I'd bet a not insignificant amount of money it'd do him good to hear something like that from one of his best friends. I'd do it, but he doesn't care what I think any more than you do.