Break up ...break...what ever u want to call it ...what to do?

My girlfriend of 4 yrs has broken up / break because she feels that she needs this to see what she really wants &she feeling unsettled, unsure about what she wants. She says she confused, that she loves me, but fears that if she remains in a relationship she will always wonder what could have been, but also fears that with this break/move of hers she will regret my loss...what do I do...its so selfish, but I care and want to give her this space...but I know what I want..but she questioning it all. She is young and I too dont want her to have regrets ... how do I deal with wanting to see her happy but also selfishly satisfy my desires? Life has blessed her of late and she on a high...on on other hand have taken a beating and on a low. How can someone with so much positivity coming her way be so unsettled &unsure & turn away from us. LoL I think with the misfortune I have experienced of late I should be the unsettled one...and confused..well now I am cause her departure has confused me?!