Stay or break up - Please help?

You know that the best thing you could do for her is to let her go. You want me to put myself in your shoes, but what you need to do is put yourself in her shoes. Would you want to be lied to? Would you want the person you love the most to be hiding how they truly feel and have it possibly lead to cheating? No.. because then it will be more painful and longer to heal. So do it now, so she can move on faster the more you keep this from her the more of her life you will be wasting. And yours! Be friends...