I will start from that when someone says that the person is special & have love for me it does not translate to the only love between husband or wife. I think we can love a person as brother/sister, father/mothehr figure or just a friend. But looks like we want to talk here just for one kind of love so now let me talk in that direction.
We all live in society and society has a norms and we do need to follow them. Tomorrow if we go just with emotions and no social binding then we may end up situation with love between any 2 people do you think any society can survive with that? where will we end up? can we enjoy any relation other than that? Life is more than just this kind of love... we do need to focus on bigger picture. Yes if couple are unhappy I will say it's OK to seperate out & then think about another relation... even than it's not easy ... as things can not be erased from life like a slate... it always leave some marks & many times not easy to come out of it...
In nutshell I think we do need to abide society norms and agree that some norms could be changed according to need of new developments etc... Just my point of view...
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