It sounds like she thought the grass was greener on the other side of the fence....and now she realizes it isn't.

So basically she broke up with you to be with this other guy she had feelings for and now shes telling him that she wants to be friends with you or else?

Sounds to me like she isn't as happy with him as she thought she would be.... So I guess shes finding that out... It also sounds like she has feelings left for you...

She probably never wanted to break up with you, but she had to be sure about her feelings for this other guy. But, I must caution you.... She might not ever want to get back together with you.... It might just be that she likes you as a friend..
I would let her know how you feel....but then tell her if the feeling isn't mutual, its ok. Cuz then you guys can still be friends but that you will move on to date other people. Please let her know you will not wait for her forever....and PLEASE don't. Cuz you could be setting yourself up for a major disappointment if she decides NOT to get back with you.....

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Appreciate the good times and learn from the bad times....