Oh man this is really so sad and torturing. Its really an undying love~ This is so rare. Are you a Taurus? Famous for having a mind set on something and not change it. A round of applause for your determination man!
I hate to spoil your plan but sometimes you have to learn to let go because you are hurting yourself so much. If she is yours, she will be yours long already ever since you first asked her. 10 years is way too long, you cant spent your life just waiting and waiting. How many more years to spare?
Learn to open up your heart to others who may love and treasure you more. You wouldnt know what you have missed just waiting for her so long. Love cant be forced, it happens naturally. For her you can just wish her happiness, be happy that she is happy, and make yourself happy too.

smile~ Dont drown yourself in deppression and unhappiness anymore. You wouldnt want her to be guilty for making you like that too.