Typical Marriage Confusion

I've been invited to a wedding...There's this girl from my class who is getting married after the semester exams. I'm confused, I don't know if I should be going to her wedding or not ?  Part of me feels obliged since I've been her good friend (my perspective of course) for over 3 years but then the other part of me, the egoistic one doesn't wants to go.

I even don't know what I'll be doing there .. I've been to many weddings, but this one is typical. Maybe I'll just send her my regards, and apologize for not coming. Its not like she'll miss me, we aren't best friends yet.