Perhaps you've already read in past few weeks articles discussing the 36 Questions to ask to determine if two strangers are not only compatible, but could fall in love (here is one such article). The questions are meant to cut quickly to sharing intimate information and touch on subjects that force people to self-disclose thoughts on topics from regrets to a treasured memory.
All based on a study, an analytic view of what it means to be "in a relationship". The actual research study paper, in all it's research-y, footnote-y glory, is here if you'd like to read it.
And so I bring you (what was practically begged for) the opposite : The New Yorker: To Fall Out of Love, Do This.