Breakup Notifier only sent out email notifications for relationship changes for those who explicitly asked for them. You could easily disable it by either personally blocking the app on Facebook, or unselecting those friends.

I wasn't making a judgement about whether I thought it was spammy, but what I considered a more likely interpretation of the available data to be. I'm also lumping everything of the nature "does abide by Facebook's terms" in the "spammy" bucket.