Here goes...

One must take steps not to sound desperate, yes?
I mean, isn't the usual recommendation to play it cool, kid, real cool...
So then how do I casually let her know I need her?
I suppose I could start by recollecting the early days of getting to know her, surreptitiously glossing over the occasions where I stuck my foot in my mouth. I could tell her how she makes me laugh, how hours of conversation seem to take seconds. Hyperbole aside, I could inform her that she is definitely the coolest girl I've ever met. Where other girls cause me to roll my eyes at their air headed-ness and naivete, she continually impresses me. Although she hates math, she's sharp as a tack.
I could tell her that one of the reasons I fell for her was a trip to the public library. Yeah, I'm a nerd, but I appreciate a reader.
There's flashes of memory I associate with my feelings for her. Riding shotgun out to her house, the windows down in the sunshine. Rushing outside of the bar to watch a brawl. Everything is more fun with her.
She's beautiful, I stare into her eyes for hours. She fits perfectly in my arms. Laying curled up with her is perfect comfort. I've sworn on occasion that we don't even speak, but just beam thoughts to each other.
To be loved by her, it's amazing. I feel it begins to define me as a man, as her man. The depression I usually suffer through living in the Bronx is surprisingly absent, even when she is hundreds of miles away.
She's all I need, I love her.
That's the truth.