To answer the exact question you asked. Yes. How does he refer to you in other circumstances like to his friends, parents, etc.? Either way, you might want to gently ask him about it and see what he has to say.

This is definitely strange...if he's only calling you his 'friend' after you've been dating for 2 and a half years, then he may just not be taking your relationship seriously. Personally I'd be very offended if a girl I was seeing introduced me to her friends as 'just a friend', especially if she was talking to an ex boyfriend. The way he just passively refers to you as his 'friend' and just says he's 'seeing someone' is definitely something you should talk to him about. It certainly is rude.

Yes, it's weird. In that I would be very uncomfortable if I were in your shoes. But I agree with Andersen777 that it's important to consider how he refers to you around others. Let me tell you a story: I've been at the 2.5 year mark in a relationship myself... I noticed that my boyfriend did not refer to me as his "girlfriend" in public, and I obsessed and worried and wondered if he was ashamed of me, or not as serious about me as I was about him. Admittedly, he didn't really refer to me as anything, and that's somewhat different from what I would have considered "downgrading" me to just a friend. But here's the important part: I talked to him about it. I told him that it upset me, but I also asked him for an honest answer about why he was doing it. You know what he said? "I don't feel comfortable with the word "girlfriend" because I see you as a woman and not as a girl." I'd still rather just be his girlfriend, but at least I understand it wasn't anything against me. The advice for you: you need to talk to him about it and make sure you each understand where the other is coming from. You can't make any real decisions or demands before that essential step. That said, if he seems to have a hangup about calling you his girlfriend in front of this one specific ex-girlfriend, then I would be worried. And I'd feel within my rights to ask him to be more honest.

I would be more than hurt if that happens to me. Maybe he still has a "thing" for that girl and wouldn't admit to her that he's already taken so that he can still go out with her. Probably, you'll have to talk to him about that without being pushy or something. Better yet, dump him! =)

Yes, strange. Subconsciously, he still has feelings for this ex-girlfriend - and the question is why are they still in a relationship? It's likely that her marriage is in trouble (a successful wife should be wise enough to let go of her previous partners), and there is sufficient reason to believe that when it fails, your boyfriend has positioned himself to be next in line. By saying you are his "friend" is diminishing any guilt she might have in interfering with your relationship. This may be considered leacherous; a deadly sin.

Yes

Yea, it sounds weird. Of course, I think many people are weird, but that's beside the point. Bottom line: Ask him why he does this and tell him how it makes you feel. I hope that helps and incidentally, people are just weird.

HE LOVES HER AND SECRETLY HOPES SHE'LL GET DIVORCED AND HE'D BE WRIGHT THERE TO HELP HER WITH ANYTHING SHE NEEDED. ITS NOT OKAY AND YOU NEED TO TALK TO HIM ABOUT IT. WHATS REALLY WEIRD HE WONT ADDRESS YOU AS HIS GIRFRIEND. BUT I HAVE A Q FOR YOU DOES HE ADDRESS AS HIS GIRFRIEND WITH EVERYONE ELSE?

Oh, I would so kick his ass.