Its simple. If you don't love her then you MUST move on for both your sakes. Make sure not to lead her on, and be on your way. Don't try to be friends with her unless you know she wont be hurt from it. Make sure she knows its over and she needs to stop chasing you if she is. You both should move on and you still have the rest of your lives to live. Ignore her family and friends because they are ignorant to the situation. Good Luck.