So THERE is your answer. You already found out that chasing her cements her decision, gives her all the power and pushes her away.
For God's sake, don't do more of it!!
Leave her alone to wonder. She needs to worry why she hasn't heard from YOU, why you seem to be moving on, and she needs to wonder if SHE fvcked up. SHE needs to realize that you were an ambitious go-getter that she pushed away, and that another girl will find you a good catch indeed. Let HER stew. Don't for one minute think she isn't concerned about whether she made the right move.
Carry on doing you, and let the chips fall where they may.