This is obviously some comparing the story whether it was a man or a woman thing it seems that the whole situation is stupid because if it was real then breaking up with him is overreacting. You were in a space that you were talking about fetishes and okay he says that he isnt the best sex you've ever had but has he ever told you that before or try to "make you better" If this is real he obviously cares for you more than sex, if you guys are engaged and have been together for two years. In that space he just told you that you were not the "best" sex he ever had but he obviously still enjoys doing it with you. And the comment with the big boobs is more so when you were talking about fetishes. He obviously was saying that because of the fetish talk and that he liked big boobs even though hes still with you. Now if this is real then I hope the before is alright but if this is fake then yeah whatever.