Am I wrong for feeling a type of way about this encounter with his best friend?

So me and my guy have been dating/together for about 5 months. I know of his bestfriend he is always with, he always saying “I’m with ___(friend name)”. We went to an event last night and he introduced me to his friend(I already of course had heard of him, I hear his name daily). We were all together the whole time and today as well. I got no weird vibes and he seemed cool and genuine. So today when I go to leave he’s like, “I’m sorry what was your name again” and I looked at my dude almost about to say “wow” but I just repeated my name and walked off. Because that really irritated me. How do I know of you so well, but me it’s “what’s your name?” I get he’s not MY bf but sounds like I’m of no importance to my dude. He had 2 friends(women) I met once months ago who he barely talks to that rushed up to me last night saying “HEY”