And you will get over him. It doesn't mean it doesn't hurt that he's flirting with other girls, now, but eventually you won't care, at least not nearly so much. Or you'll wish him well and you'll honestly hope he finds someone who makes him happy, because you'll have found someone who makes you happy. Someone you could share secrets with all along (or, you had to keep secrets from for a while but when you told them the truth they understood why. I mean you really COULDN'T tell Draco, what did he And didn't mind.)