Was I rude to his friend?

So I was at a bar the other night and a guy approached me as I got a drink. Nice, cute, not really my type but I chatted with him. He invited me over to a table with 2 female 1male friend and HIS FRIEND and I hit it off immediately. He liked a lot of the same music, movies so I ended up sitting closer to him - gave my number etc. No one really said anything or seem to care about it then, but as I was telling a friend, they said I should apologize to the first guy? Really? It's not like were on a date or something, I just liked his friend more. I'm not from this country so it's a kind of cultural taboo? I don't really understand what was wrong.

Was I rude to his friend?
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