I definitely know how you feel. My friends post a bunch of things with their new buddies and all these great adventures that I will never get to have with them so it's definitely normal to feel jealous.

I guess where you go from now isn't all that clear but I think the important thing to remember is that true friends, no matter how long they're apart, will hit off when they see each other again. When my friends come back from college on break it's like they never left. But at school they rarely ever contact me and if I contact them I rarely get a reply. It's more of a "I don't see you so I don't think about you" sort of thing.

It really is a tough choice but if you were really close and you regret the decision I would encourage you to send her a message saying something like "I'm really sorry I tried to end our friendship. I was jealous over the fact that you had so many new friends and it felt like you were leaving me behind and that just made me so sad. I am really sorry that I reacted so terribly and hope you can forgive me." and then leave it up to her. The most important part is to be truthful. And then you'll have tried your best to fix the bridge but she has to meet you halfway.

Remember, it is never too late to try.

Best of luck!