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Depends on why of course. If he just isn't naturally attracted to you, then you have an up hill battle. You would have to figure out what he didn't like and change it. Maybe just a hair style or colour change, or maybe clothes, or even personality. But I have rejected girls before simply because I was interested in someone else. I have also rejected before because I was in a personal situation that I was having trouble in my life money and job wise and just didn't have the social confidence and wanted to avoid the complexities of dating at the time.