No matter how much yu love someone a bad relationship isn't worth
Many times when either a boy falls in love with a girl or a girl falls in love with a boy it seems horrible that the love isn't returned.
If you love someone that doesn't love you back break up with them. Don't date or even call them. If you continue in a one sided relationship like that you'll end up looking like a fool.
Break away and sit on the pain. In time the pain will go away no matter how bad it seems at the time. As time goes by you'll feel better and better and when you get with someone else you'll be grateful you left.
Leave forever. No calls, no letters, no cards no nothing.
Pretend your ex never existed.