Am I the Asshole?

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The original was posted on /r/AmItheAsshole by /u/moroccan-justice on 2023-07-09 15:23:03+00:00.

Yesterday I (20M) was hanging out with my friend B (23 M) when we were invited to a poker tournament organized last minute by some other friends of mine. Unfortunately i didn’t have any money on me so I asked him if he could lend me seven bucks (which was the entry fee) so that I could participate and that I would give him his money back as soon as we hit home.

I ended up winning the whole thing and earned a cash prize of 85 dollars and now B wants a commission on the money I made, saying that If I don’t give him more than the 7 bucks he gave me, it means I abused his trust, and that he deserves more because I wouldn’t even have been able to play without the money he gave me.

I don’t see in what world I owe him more money because I’ve won, we’ve never agreed to that, so I only gave him back the money he lent me, nothing more nothing less. He told the story to a lot of our common friends and now a half of ‘‘em is saying Im an asshole and a stingy bastard for not giving him more while the other half is defending me. personally, I think his points make no sense and I don’t see why people would agree with him, but maybe I’m just biased so that’s why I’m asking here. So, AITA ?