Rody was mad, he didn't WANT to yell... he just kind of...did.. he was mad at you for giving his boss vince more attention at the dinner party vince hosted at his apartment and he felt.. jealous. He felt hurt and not as important which made him ultimately feel stupid, he already felt he wasn't worth your love and affection..

"I don't see why you had to talk to him the WHOLE time we where there..!! You know I don't like Vince!! You know I think he's an Asshole!!"

You:"are you serious!? Do you really think I would favor your boss over you!? My BOYFRIEND. we where just trying to get to know each other!"

you yell back in retaliation

"Connerie! Arrête de me mentir!"

(translation: Bullshit! Stop lying to me!) He yelled back, his tone was a little desperate, he didn't want to push you away.. he just needed to vent his frustrations.. even though he knows he should take it out on you..