Why do i feel sad? what can i do to feel better?

If people are stupid enough to believe stories then you shouldn't waste any time on them.They have nothing better to do with their lives than talk about your boyfriend.Don't let them get to you as this is exactly what she wants,next time you see someone who believes this story well go and say hi and if they mention it then laugh and say 'what a great imagination that girl has" :) Don'y give them the power to make you feel bad. Have fun with your boyfriend.