i'd say it depends on how much doubt you feel. the last relationship i was in, i didn't end it immediately. what i did was i told myself i was going to start taking a little more personal time to myself and for the things i wanted. in other words the priority of the relationship shifted. and it was fine for a while, but when i decided to shift my attention back to it after making it lower on my priority list, that's when i realized it wasn't going to work because nothing had changed on her end and that's when i broke it off...