Most Helpful Girl
The only thing you can do is talk to her, and it sounds like from your comments below that you already have. She said she doesn't see you together long-term, that you two aren't meant to be.
I'm sorry that she feels that way. Unfortunately your love isn't being reciprocated and she is done.
The best thing you can do for yourself is to stop contacting her. Maybe if you stop contacting her and distance yourself she will start to see how much she misses you. I agree with how you would be confused in this situation. I think anyone who is displaying that type of behavior would make it seem as though they also like you.
It's not fair what she is doing, as she makes it seem as though she likes you too when she doesn't apparently. So stop talking to her, stop seeing her.
IMO it's quite obsessive of her to call you 2-5 times a day when she has no interest in you relationship wise. Plus being super clinging and also affectionate in ways too.
Put yourself first, try to do things for yourself and don't worry about her as much. If she truly doesn't have any feelings for you, she will go away. If she finds she still does like you, then she will come back.
This is IMO the best thing you can do. Either way you can then gauge her feelings for you.0