How to deal with your best friend moving away?

My best friend of 10 years is moving to another state in a few weeks and I'm sad and also kinda scared about it. We hang out all the time, have the exact same humor, values and morals, similar interests etc. As much as I understand her reasoning for moving, I'm still sad about it (so is she). I'm scared that we're gonna drift apart and our friendship won't feel the same anymore. Also I kinda don't have anyone else I'd wanna hang out with. I have some other friends, but I don't connect easily with others. I tend to distance myself and feel lonely even when I'm in a big group of people I genuinely like. Honestly, this hasn't really been a big issue in the past because I always had my best friend and that was enough for me. I'm scared to be alone all of a sudden while she's making lots of new friends, and I also don't want there to be any resentment building up because of that. Has anyone experienced something similar and how did it work out for you?