Long term relationships hurt like hell when they break up. They usually put a person back to square one from where he/she had begun. I believe you are looking for a poll to understand something/ conclude something.
Human relationships are the utmost complex ones. If you want to find the reasons of break up you can go through my poll "Tell us why did you break up?" http://vinswins.hubpages.com/hub/The-Biggest-Mista...
I believe even there is some really good content here at hubpages that will help you understand it.
You can even visit http://www.VioletBlues.com to understand more about relationships.
Wish you all the very best. Good Luck!