You aren't screwed.
Think of this on a smaller scale - it is one funeral(who wants to go to funerals anyways ) which will be over in a matter of hours.

Perhaps you could have your boyfriend tell people that you just arent feeling up to going.. maybe say you have the flu.

AS for the question you ask about staying with this man for a long long time.. well that is something you will need to assess for yourself. I think though, just opinion of course, that this will blow over eventually.