I got you ! Its infact a two way model. Either 1 or 0. i agree!!! IF there is a break-up for a relation that never existed "literally" ( possible because once you're indulged in relationship you shouldnt be looking anymore ) : 1 If the probability be 0 , then either its that you cant break-up cos you are bound to tie on your relationship but you were actually seeking for, and what!!! . you'll eventually remain the same for the rest of your life .. without the break-up , lets say .. unhappily married! Or, the other option could be , you keep on loving that girl till the rest of your life.. and any events on her side(supposedly marriage here) dont trigger you to get your life on your own. You turn depressed ( may not as well ) , write abt her , think abt her .. and what else .. [ hypothetical one as you said ] PS: this seems a little biased on the male species.. but thats what i think on my perspective. not necessarily convince ya all.