Breakups aren't mutual decisions, and the person doing the breaking has lots of time to think things over and figure out an interpretation of events that they would like to hold as true. Then, they have the opportunity to start "testing" the relationship by monitoring interactions to see if they can further prove what they've already decided is true. Then they get to present all their "evidence" to their surprised partner.

All that to say, there is no objective truth here. She has her way of seeing things, and you can continue to have yours. She has decided that you aren't the right partner for her, and eventually, you might come to the same agreement. The important thing is for you to look back over the relationship and make sure the person you were is the partner you want to be. Make adjustments based on what you see in your behavior that you'd like to change. And, after some time, go out and try to find a partner who wants what you are offering and is what you are looking for.