Dilemma

I'm not sure what will happen between my Beloved and me. She's not sure what she wants to do. We have a long distance relationship and it's proving pretty hard on her. This is my fault.. a fact I am well aware of. I don't mean to do any of the things that have hurt her so badly. I truly adore her and am certain that we are meant to be together and because of that things will work out between us. But she's unhappy. Her happiness is more important to me than anything else on this earth. She says she wants to leave me, but refuses to do so because she knows it will break my heart. Should I make the sacrifice and leave her so that she can find her happiness?? I think I should. I love her so much.. I don't want her to suffer. I refuse to be the cause of her unhappiness! And yet I cannot summon the strength to leave her. I just don't know how to live without her. We've been through so very much... I need her. She is the air I breathe, the very beat of my heart and soul. How do I give her up? How do I survive without air? The answer should be simple... Because she's unhappy... But... I'm weak. I'm so ashamed of my selfishness. I just can't help but hope that she'll decide she is happy with me and wants to stay not for me but for her. Yet, how will I ever know? How can I be sure if she's truly happy or merely faking it so she doesn't hurt me? What do I do?