i think a good relationship is one in which you want to spend time w/ the other person.
my therapist asked me once if i could go on a great vacation, would i want to go w/ my ex. i didn't. wasn't a good relationship.
also, i really believe that a good relationship is one in which partners respect eachother. without respect, there is not much. lust fades over time.
good question, simple but v imp't.