「え、ダメなの？」「もちろんだめだよ！」「俺じゃダメってこと？」「…？俺じゃ？」「え？」「え？」

「Not good enough, huh?」「Not good enough, obviously！」「I'm not good enough for you, then?」「...? "I'm"?」「Wait, what？」「Wait, what？」

(TL's a little looser so it gets the casual humor across)