Dear Cho,
Integrity. That is, or should be, the basis of any relationship. Ours is built with a foundation of lies at least not to each other. These lies are towards are most trusted friends. We've been hiding our relationship to only let it out at night and in shadows of the sun. Never have we been out in the open to freely express our true emotions. I don't dare tell Harry, though his love for is strong, it isn't as passionate as mine. You could describe it as a type of puppy love. He's just dumbfounded by your beauty, who isn't? Yet, he has not dared to ask you to even consider the two of you because deep down, he's just using you to hid his love for someone else. I see him take daily glances at Hermione, they aren't just a friend type either, it's a full grown longing in his eyes.
Getting back on topic, I never want to leave you, ever no matter who finds out. I'd kill for you Cho, and die trying to win you back if I ever lost you. Someday we need to tell them all, to just yell out who we love. I long for that day to come when you can scream out my name just any day in Diagon Alley and say you love me as much as I love you or even more.
From here I say good-bye until I see you again, the usual spot on the first day of Hogwarts? Harry's watching me suspiciously and I feel liters of guilt running through my veins. Please owl me but not using your regular owl, Harry will notice it and mistake the letter for him. Until we meet again I'll dream about you. I just hope for the day when I call out your name in my sleep just to let all my guilt bleed onto my carpet.

Sincerely,
Ron.