My only best friend of 13 years is drifting apart from me?

I've always been shy and she's okay. We went to different schools after graduation. She found a new bestfriend and they call each other babe, love ya, things like that. I keep it in my heart and don't say these things. It's always been like that. Everytime she finds a new friend, she'll ignore me and after some time, come back. Classmates would always ask if she's neglecting me. But this time, we're not even in the same school anymore and we're drifting apart so far, I don't even know if we'll get back. I've never had a bf and she has one now. There are more & more differences between us and I'm always the one to ask her out or strike a conversation or comment on her facebook etc but she doesn't take any initiative to talk to me or anything. When she posted a movie trailer, I commented asking if she wanted to watch it together and she didn't even reply. What should I do? I'm also shy and don't have and don't know how to make new friends