not godzilla related but im realy feeling down

ok so there is this girl i like her name is heather and i have told her i liked her and she said she liked me so i thought we would get to gether well we talk every day so i was excited cause i am home schooled and 15 and have hardaly any friends and have never dated or had a crush  but today on facebook it said she was in a relansonship with someone so i have been feeling realy bad all day please help :'(