If she/he can live their life without you, let them. Your future will not end to the person who will leave you. Your future varies on you, varies on how you drive it. So if that person keeps on bothering your life and being a hindrance to your success, let them go. You have to understand that their part on your life is done, you have to remember: your life is more important than the person who left you, your future is waiting for you and don't let it be hindered by the person who is excited to leave you, don't choose the person eho broke your heart over the precious future waiting for you. Move on, accept, then live life. Keep moving.