>>1 loving someone so much that all you want is their own happiness over your's is tough but you need to think and consider the options you have. You can either love her from a distance, just as long as she's happy then you're happy, with out without you as her romantic interest, like being her friend alone is enough for you. Or tell her that it's too hard and heartbreaking to be around her anymore and that you can't be her friend and that you're sorry, just tell her the truth.
But please don't kill yourself, you'll find love again, stay hopeful :3