Break up?

Hey guys, this may sound pathetic but I've been dating this guy for 3 1/2 weeks but known him for 10 years. He asked me for nudes and I said I didn't want to. And he was like do u want me to start and I said I don't want to see your dick. And he sent a pic and said do u like its size. I said a lot of things after before breaking up with him. Did I do the wrong thing. I feel weird.