I'm going to say it depends on the people and the relationship, it really doesn't matter what kind of relationship it is specifically, if you love the person, care for the person and they are so much a part of your life and that ends one day it's going to take it's toll on you, it doesn't matter what kind of relationship it is, it's going to hurt, the change can be frightening and what you do can be confusing and scary. Some people are able to cope with these things better then others while other people just fall apart, they don't know what to do after so long of living a life with someone who was there with them. It depends on what you put into it and how much you've invested into the whole relationship. Some people I thought were strong after a break up went to pieces that amazed me, others I figured would take it hardest seemed to have little trouble and continued on in their life.

Really does depend on the people.