When best friends forever isn't forever?

I don't think I'll ever have best friends like I used to. I'm sixteen, and I used to have the two best friends ever. Chelsea, me and her were absolute soul mates. Twins separated at birth, we were convinced. Then, we met Georgia, though shyer than us she brought her own unique charm to our little best friends trio. Then, in 2006 we found out forever isn't all that long. Chelsea died and after that Georgia and I just.... couldn't be around each other. It just wasn't the same with out Chelsea. I haven't talked to her in a couple of months, and Chelsea's eighteenth birthday is coming up along with the three year anniversary of her death. It's so sad how things change and everyone goes their own way, or unwillingly goes away. How do you find more best friends? I still haven't really figured out how to make a new best friend. Us three had been together since we were little kids. Do you really ever have only one or two best friends in your life time? Have I already used up all my best friend cards? Life just isn't what it used to be.