Should I feel bad?

So I was over weight In 9th grade at 190 pounds 5"4 I'm now in 10th grade at 140 pounds 5"5 I worked really hard to get where I am and still struggle with my self-esteem it is not like me to do this. So in Grade 9 this guy was always super mean to me but I always had a crush on him and I don't know why he would call me ugly and fat all the time not in a kidding way either in front of all of his friends. He knew I liked him. So this year I look better then I did last year and have been asked out by 7 guys already. (Not bragging I don't think I'm attractive at all). But today he came up to me with all his friends and asked if I would go out with him. I said "last year you constantly called me ugly and fat and now I'm skinny so you want to date me? No I will not date someone as shallow and disrespectful as you go to hell" I don't know what came over me but I kinda felt good and I kind of felt bad I don't know what to feel. Iike I'm 15 I know he didn't want to be in a relationship because he liked my personality.