Why do people hold relationships so cheaply?

I really appreciate feedback here- I put this out for everyone to read, digest, criticize, and agree/ argue. I do this in the hope of better understanding Humanity, and the human condition. I do not intend to offend, but I make no apologies if I do so- these are opinions based on observation, and as such must be argued (politely, of course) in order to be refined into something more solid.

You know the cliches, the lame duck excuses, and the pseudo- intellectual excuses perpetrated and perpetuated in society for ending personal relationships. Many of us have used them at some point in our lives, and we know damn good and well what we said the reasoning was and what it actually was were two different things. When you want to get right down to it, cut the bull and get to the truth, we end relationships because of whatever selfish reasons we have: one party doesn't want a commitment as much as the other. Why?

Today's society is one in which everything is diluted. Our language, morals, laws, courtesies, traditions, foodstuffs, beverages, everything is watered down. When a person in the early to mid 20th century said "So help me, God" they by God went and did what they swore to do-sometimes this was not so good, and sometimes this adherence was spotty at best, but for the most part it stuck. Now, don't get me wrong- these were not idyllic times we should long to return to, but rather the attitudes concerning the aforementioned concepts. In today's society, we prefer what makes us feel good rather than what makes us better, we prefer to throw something away and get a new one vice caring for what we already have. We knowingly elect polished liars, we care not for the plight of anyone else, we demand everyone bow to our own selfish whims, and then we have our language- how cheaply we use that!

Listen, vows are supposed to be more than mere words, once spoken easily forgotten. They are binding contracts to the god(s) you worship, the world you live, and/ or the people who hear them uttered- including the spouse-to-be. This is not how people view them- they believe that if they "love, but are not in love with" their spouse, then it's okay to divorce. Typically this attitude leads to extra marital affairs, and shows just how much of an emotional two year old the cheating party actually is. The point is, though, that rather than fix what's broken, rather than honor the commitment they've made, rather than do what's right by their children and their word, they break their vows.

Here's a hint: Love is not a noun. It is not an emotion that is self serving, nor is it one that is self perpetuating- you actually have to do something to keep it alive. It is a verb more so than a noun, and it is also an adverb. You cannot expect to stay "in love" forever if you're relying on the other party to do all the giving. If you are with someone who cheated with you on their previous spouse/ Significant Other, then you had better expect they're cheating on you.