Please help me find this book.

Looking for book where h is in love with her best friend H.  I believe the H is engaged to be married to another woman.  h finally tells H that she loves him during H's going away party at a bar.  They get into to an argument outside and the H leaves h alone.  h ends up getting raped by the H's brother.  Years later the H comes back, he never knew about the rape.  The mutual friends have keep the secret of the rape and that the h gave birth to the brother's baby.  I think the brother died the night he raped the h and or before she gave birth.