hm. You've been dating since January and haven't had "the talk" yet? Try to think of it this way:
If it was HIS brother's wedding and even though you hadn't had "the talk" he took someone else as his date, how would you feel? It's really about people's feelings. Yours included. If you don't want it to be more serious, then it shouldn't be. but be honest with the guy too. he sees it as more serious than you do, it seems.
That is very true. If he had not invited me I would have been really upset. I had not even thought of that. I guess I just don't like being taken for granted. It is sad, but true, that sometimes you just can win with women (or at least me! )