I think Nux liked that guy who likes Jooyoung, which is the reason why he chose to look like Jooyoung in the first place. That guy(I forgot what his name was, do tell me if y'all remember) even told Jooyoung that he is the only one who can get Nux's blood anyway. When Nux finds out about the contract that Jooyoung had with that man and the fact that Jooyoung treats Doo with so much importance, Nux then vents his frustrations to Doo and this thing spiraled into this and that, y'all get what I mean? (〜￣△￣)〜
I think Nux liked that guy who likes Jooyoung, which is the reason why he chose to look like Jooyoung in the first place. That guy(I forgot what his name was, do tell me if y'all remember) even told Jooyoung that he is the only one who can get Nux's blood anyway. When Nux finds out about the contract that Jooyoung had with that man and the fact that Jooyoung treats Doo with so much importance, Nux then vents his frustrations to Doo and this thing spiraled into this and that, y'all get what I mean? (〜￣△￣)〜