You're coming off as very needy. Just a heads up.
First, you stalk her Facebook profile to see if she has posts that are MAYBE about you. Sure, it's interesting how she's suddenly saying she's glad she doesn't have fake friends in her life anymore after you messaged her. That does not necessarily mean the posts are about you (unless she name-dropped you, then she's being rude). She has other friends and likely has other conflicts / drama going on in her life. People like that have a hard time maintaining stable relationships.
Second, you have problems with pushing people away from you. That's because you're clingy. No one wants to be around someone who tries that hard to be the best friend ever. It may seem like always being there should be the greatest trait you could have to offer a new friend, but it's really not. In fact, it's a little unsettling. When you're making new friends, people expect for there to be an element of distance. You're new to each other. You should not be BFFs right off the bat. As a friend, you should be there for people WHEN THEY NEED IT, not all of the time.
It doesn't help that you're going to your current friends with the same issue. They've given you the best advice that anyone can give; get over it. Ten years is a long time to be friends with someone, but we all eventually "grow out of" certain friends. She has moved on with her life, but you're still emotionally stunted. Your friends are trying to help you, or at least, they were trying to help you. Now, you're coming at them with the same problem and same excuses. No, it's not easy to forget about a decade-long friendship. However, you're hurting yourself and damaging your other relationships by dwelling on the past.
Things that will help you move on:
- Block her Facebook so you cannot view her page. In the off chance she replies to your message (WHICH IS HIGHLY UNLIKELY), you won't see that either.
- Quit watching old movies / TV series that you have emotionally connected to her. This is temporary. I'm not saying you can never watch X show again in your lifetime, but it's obvious that you're gravitating towards nostalgic hobbies / interests as a means of having some kind of connection to her. This is not healthy.
- Also, quit visiting places you have associated with her. Again, this is until you have moved on. If it's a favorite restaurant, then go to a new restaurant. Go someplace with your other friends.
- Join a group exercise or some other type of class in your community. A new hobby will take your mind off of the pain AND you will meet new people.