Ron,
I'm on your side, you know that, right?
I may seem like a bitch to you, but the fact is I do care for you Ron. I care for you enough to stick by you no matter what, and I always will stick by you, and Harry as well. Forever, and even beyond that.
I care enough about you to have one of the biggest arguments with my parents earlier that I've ever had, and I defended you the entire time. And Harry as well.
You're someone who is worth defending. Even if I'm not worth it in your eyes. I know you're not the type of person to do that sort of thing. I mean, you saved my life once. Did you really love me enough then?
Here's a secret - one of my first fights at Hogwarts involved you. I sort of told Percy not to tell you.