Noor was angry maybe coz Arjun didn't tell her before about his real identity even that time when he spoke to her and asked her to have hope...that time he knew who Noor was and knew exactly what her problem was and still he didn't tell her anything...so maybe coz of that
Otherwise I don't think she should be upset with him...coz she doesn't know that he is RJ AJ yet...she knows that Adi's brother helped Zoya out as Zoya her self told her about him...she herself hid her identity and so did Arjun so it shouldn't be a big deal.So, I guess Noor is upset coz now she thinks Hoodas are trouble plus Arjun didn't tell her about his real identity even after he knew who she was.I want a proper progression and development of ArNoor story...Noor might soften towards him when Arjun will help Zoya..when she will realise Adi and Arjun are supportiveI am curious to see how the court case will proceed