Constantly put him down,embarrass him (especially in front of his friends and in public), call him names,make fun of him and especially his penis size, use the words loser and stupid a lot, talk to other guys right in front of him, during sex keep saying"are you done yet' and after sex say "glad thats over with". Make this your daily routine, stick with it and you should kill his ego in no time! Unfortunantly I don't think he will go crazy over you after all that.