The fact that she rejected a guy that her parents had chosen shows that she did love you at one point. It could be possible that you didn't live upto her expectations as time went by. I don't know how good of a bf you were to her but you can conclude that on your own. Give it a thought. Did you give her enough reasons to be convinced that you were the one she should get married to? If you think you did, then she wasn't the one for you. If not, then you know the answer.