To me, what darkside means is, when you are nice to the person in front, but behind, you really dislike the person to the core, and bitch about him/her all day to other people. That's why I can clearly tell the world that I'm not a darkside person. Because when I dislike a person, I make it very clear, without reservations. I know i know. I'm very extreme. But that's just how I am.
But to those that I like, I'll treat them as well as I treat myself. I'll sacrifice so much for them, just like how I used to sacrifice for some people I used to call friends. Only when I feel like I'm being used, or just discarded uselessly, then I'll stop being stupid, and I'll stop sacrificing.
I'm not such a mean person all the time. Because before I actually start disliking someone, I tell the person first, what's wrong, blah blah blah... If he/she chooses to be in his/her own world and ignore it all, that's too bad.
I know I can be a better friend than that. But I'm not a stupid person also. I need the energy for other things. We're all kinda old already I guess. 20s not young anymore.