@bbatheson - The breakup was only 3 weeks ago and it sounds like she’s still confused about her feelings. By saying she isn’t sure if her feelings will go away and isn’t sure if it’s gonna happen again, she is giving you fair warning that a relationship with her will be unstable. Therefore, if you get back together with her again and she leaves you, she can say she warned you. The problem with all this is that you would be walking on eggshells not knowing when she might dump you at any moment. No relationship is guaranteed to work in the long run, but people who love each other go into it hoping and wanting it to last and they feel secure in their love for each other.
I’m glad you told her you need space and I hope she honors it this time. You need time to figure out if this is what you might want and the damage it would do to your self esteem to have someone say they’re not sure about wanting to be with you. She should be all in or all out. More space might give her more clarity as how she feels and what she wants. And the same for you.
I’m sorry about the situation as it stands now and it must be awful for you. You sound like a great guy and you deserve someone who loves you 100% and not someone who is wishy washy about it.