For example, friendships. Perhaps one of the most easy ways to observe this is the frienships that develop in elementary schools. Small children make friends because that is what they're taught; be nice and make lots of friends. However, the sad thing is that children aren't taught that it's ok not to like someone, that they can't reasonably be expected to be friends with everyone. So, a small friendship is formed based on the brain-washed like education of 'be nice'. They go over to each others houses and are invited to birthday parties. Then one party, or perhaps both, realise that they don't really like the other person, and they quabble and all of a sudden decide not to be friends anymore.

In the grown up world of complex relationships, a more intricate version of the elementary school factor often occurs. There isn't nessisarily a large argument that takes place that sparks the beginning of the end, but maybe a group of smaller things happen that become increasingly important to the contribution of the demise of the relationship. Annoying little habbits that you notice become all of a sudden big things.

Maybe there isn't even really anything that bothers you about the other person, or vice-versa. But communication suddenly becomes harder. They don't answer the phone, or return your calls as promptly as before. Even more unsettling, it doesn't particularily bother you. It's just accepted that both people understand whats happening, and rather then beat a dead horse, things are let be. The relationship fades into obscurity. Left to the awkward 'Hi' when pathes cross in public.

There are of course exceptions to this line of thought. Some frienships are lifelong, and some come crashing down in a firey inferno of resentment and hatred.

As humans, we know that eventually all things, good and bad, come to an end.