Most Helpful Girl
Well, some people wouldn't mind being introduced that way, as a friend. Like I was dating a guy (only few dates, we weren't in a relationship) so he introduced me "This is my friend, ----" and I smiled and greeted his other friend. That is totally fine to me.
If you are in a relationship, then yeah I'd hope he would said I was his girlfriend. Otherwise I'm not bothered by friend. Buddy... sounds more platonic and that he is not interested in a possible relationship with me. So I would lose sexual interest in the guy and just see him as a "buddy/pal" and nothing more.
Most Helpful Guy
it's not the best idea to call her a friend or buddy if you wanna seriously be with her. it can hint towards u not being the boyfriend for her, when u call her just a friend.