My bf was being a jerk, but was I too harsh?

Let's see here. He joked about your dad, calling pneumonia a "sexy" disease. Probably because his brain is in his pants. You want to lose weight, he likes you the way you are, and he made a joke about your "fat ***," which he supposedly likes, breaking his computer. He sends you nude pics--wow. He's told you he would be nicer if you had sex with him. He's already told you he is a jackass and wants to change him. He was telling you the truth. I would let him be some other girl's work.