yeah, but it's not very nice

my best friend for 4 years is the polar opposite of me. He's extroverted (and no doubt popular), easy to talk to, entertaining, and I always enjoy my time around him. We're best friends, we call each other almost everyday and watch anime/play games together a lot. (which was how we bonded in the first place: anime and games)
i actually liked him for quite some time. At first I really thought of him as a good friend, and then I was in denial that I liked him in a different way, and then I came to accept the fact that yeah, I liked him.
I sure as shit know that he doesn't like me back. He's a touchy person, and he used to have a thing for smacking me in the head or pinching my cheeks, which made everyone tease me about it. We used to skateboard together afterschool but after his friends saw him with me and teased him about it, he texted me saying that he "cared about what other thought" and that he didn't really want to go skateboarding with me anymore. Which was kind of ouch, I guess.
He still doesn't realize I like him. We still call daily and play video games. But he's venturing into dating and stuff and there was a few girls who hinted that they were interested in him and he was asking me for advice on answering them, and getting girlfriends and whatnot. Maybe it's because I'm biased, but one or two of the girls he meets aren't very good people- but he just doesn't realize it yet.
To be honest, yeah it sucks a lot. My mood goes sour whenever he brings up stuff like this (which makes me grateful for the masks-they hide my sour face!) but I know that I have to be a homie and help him, I really have to fight my desires on being selfish, like trying to sabotage shit, and ask what's best for my friends.