Boyfriend said his exes boobs were bigger than mine and she has that winning over me....

Doesn't matter how we got onto this conversation but he said that! And I felt like shit and he didn't understand why I was upset. I'm a B cup. I know it's average but I wish they were bigger and he saying that was very upsetting. Probably could have handled the situation better but I then got mad and said my ex made me cum way more times that he ever did. Then he said "wow I've never seen that side of you, I didn't realize you could switch so easily, the way you were looking at me like you wanted to hurt me". I did want to hurt him! Anyway we made up and things are good now but is this not healthy? Like it was a very harsh couple of minutes and i can't get past it.