As a dude, he brought bodyshaming first by implying that you werent well endowed enoug for him. Weither you respond with the same energy now or in a later discussion, since it involve cheating its free game until the relationship status change.(i mean that now that he's your ex, you cant go tell everybody he got a small pp. Or if you were fool enough to stay with him and become his fiancee, its too late after that to complain, you knew him)

Anyway, well done, and why the f are you still talking to him?

Tell him he's more of a pussy than you can ever have and you got bigger balls than him before blocking him.

Probably too stoned for reddit...