I've been with my bf for over two years now, and things seem to be progressing towards marriage one day although neither of us are ready for that step just yet. His longtime friend is getting married in the fall and that is where my dilemma comes in. While I like his friend and his fiance, we do things as a couple occasionally, I'm not exactly really close to either of them. My bf and his friend hang out a lot, but I never do things with the fiance. We don't really have a lot in common, have very different interests and ideas on how we like to spend our time.
They have asked my bf to be in the wedding party, which was no surprise. To my shock though, they have asked me as well. I feel like they are asking out of obligation to my bf, and not because I'm really good friends with the bride. It just feels wrong to me, and honestly don't want to shell out the hundreds of dollars being in this wedding will require. I'm trying to save up for a new car that I desperately need and feel a bit resentful that I'm going to have to spend it like this. If this was a close gf of mine, I wouldn't hesitate.
My bf got mad at me when I wasn't overly excited and I don't know how to explain it to him without causing hurt feelings. Should I just suck it up, paste a smile on my face and go along with it for my bf's sake?