I think if there is something missing in your life, I think you would want to find a way to fullfill it. However, if it is sex or no communication in a relationship, shouldn't you work on that first?
I don't know. I guess I look at things in a simple way or from my simple mind!
I'd first work out the problem and if it couldn't be fixed....and you have exhausted your resources, end it.
But, I'm sure that was too simple!