I need advice. Boyfriend doesn’t love me all the way

Hey loves.. so I have been with my boyfriend for 3 years now. And he came out yesterday telling me that he just won’t marry me because my butt isn’t big enough for his standards. He said that everything else he loves about me but he can’t love me all the way because of my butt. Like I am so confused... I am so in love with him. But idk if I should leave him. I’ve been working out but I’ve been doing it for me not for anyone else. Am I the one being over dramatic about the situation?