Why "You're the air that I breathe" is a stupid expression

But sometimes the cheesy lines are the only one that work

"You make my heart sing" "You make my world turn" and yes, even "You're the air that I breathe" 

None of then mean anything, but any of them means everything when said at the right time, in the right tone, by the right person.

...the air that I breathe...

Coming from a stranger at a railway station it would be pointless...and a little spooky.

From a drunk in your local, annoying and probably slightly offensive.

But coming from a lover, or a potential lover, it's an admission of need of the other person for continued comfort in living. It's a way of showing one's vulnerability, and a far less frightening thing to hear than "without you, I would stop living" 

Hyperbole is important in the language of love. So are admissions of defencelessness. So much of love, particularly new love, is drama, extravagance, exaggeration...

What a shame it would be to stop using the beautiful words of love, the amplifications and obscufications of love language simply before other people have used the same words to express the same feelings before.

When spending a lot of time with someone, in an environment that they are often in (such as their bedroom), the little skin particles that become dust will eventually become agitated, and find with way into the air and into your lungs.

Hence, while the expression "you're the air that I breathe" might be a silly thing to say, in some cases it is accurate. More often, the expression would be that "I'm the air I breathe" if you breathe in dust of your own creation, but life is funny like that.

And that is love. I remember a few years ago, when the actor Charlie Sheen was involved in a court case involving a lady called Heidi Fleiss, a madam. Several writers wondered why Charlie Sheen - a relatively wealthy, relatively famous and relatively good-looking film star, blessed with the genetic material of his father, Martin Sheen - they wondered why Charlie Sheen would need to hire prostitutes, given that he would presumably not have difficulty attracting women to his undoubtedly large house. The reason given was that, for many men, the appeal of a prostitute is not that she arrives on time and performs unspeakable acts; it is that she eventually leaves, she can be dismissed on command. It is said of butchers that they can cut, mash, sell or use every part of the pig, except for the oink. The same is true of love.

Love is not like that. It is rather like hiccups, in that it takes a major event to prevent its recurrence. Without a traumatic shock, the hiccups continue, because they are not under conscious control of the body. As with nosebleeds and milk teeth, they are a continual reminder that our minds are merely passengers in a vessel which cannot be controlled and which is driving towards the edge of the world. Although many have mutinied - particularly the psychedelic experimenters of the 1960s - no-one has yet managed to install a lasting revolution. Our bodies are an amalgam of banana republics, but armed with nuclear weapons, and built on fault lines. The plates will shift, they will shift one day.

Love is the process of sucking smoke-filled air through gauze. It suffocates, and the end result is a dirty piece of gauze. It is not pleasant, and we watch as the gauze becomes ever-more filthy, and our doom approaches. Without it we would die. Desire draws me on, and fear pushes me back. Heroin itself is not harmful, instead the harm comes from society's reaction to the drug, and from the fact that someone who is in love with heroin is unable to look after and feed himself or herself, and to afford or procure the drug. We all need someone to nurse us, and that is love as well. There is so much love which is not in itself harmful, but which is unacceptable to society at large; or which is too expensive for the limited resources which most people command. Yet I must never speak of this. I was young, myself.