Rejection, how do we deal with rejection?😭

I have crush in this girl for over a year . Finally decided to shoot my shot , omg 😢 She let me down gently, it wasn’t a very hard no , rather busy coming period, maybe in the future we can kind of rejection. Then she went ahead and posted pictures with another girl. Not sure if to cry or laugh from this😢 Someone tell me please how do I stop feeling stupid😏