love or frienship ??

I have seen friends quarrelling and I have seen couples quarrelling But I really don’t understand what is that magic that works between friends, that makes them bury everything behind and remain friends. Well, with the couples it’s an exception Seriously couples start silly fights on silly things and things go out of control and issue becomes bigger. Why is it so? Why couples fight, and then break where as friends they patch up their differences. I guess it’s a problem with possessiveness. Don’t know why we can’t give that freedom to our spouses that we give to friends that “I love the way you are “ and still don’t possessive about it. Why? Why? Why? I guess not all couples are good friends. But does that mean just friend ship enough to make a good couple? I am perplexed. I found this article in a website which discusses it But still I am confused about it. Can somebody help? BTW here is that article Tweet