Why is it that couples argue, quarrel, scream at each other and basically break each others' hearts by saying things they don't mean?

Why would they do that, only to apologize afterwords, giving excuses that they didn't mean a single word they said, asking for forgiveness?

I suppose this is probably linked with the fact that you're never civilized with your family, and so extremely polite to people who are nearly strangers. But it is hard to look at someone screaming at you as a form of affection don't you think? Well, its true that a relationship without its' downs is definately incomplete and very much stagnant, and making up after a shouting match does has its charms, but i still don't understand...

Sigh, the expressions of love in the world is such an obscure subject, no wonder music in general uses it as a base theme... hahah...


Its just another one of my musings i guess.