Derek drove in a foul mood, his anger had got the better of him. He couldn't just stay there and watch that interaction. Did she go with Mason? He did seem pretty persistent. Would she have gone with him instead had he been as persistent? Did he miss a chance? His anger and these subsequent thoughts were driving him crazy. He wanted to reach home soon so that he could call her, and also to confront his mom over her behaviour. Why his mom was so cross at Arya based on her assumptions, he had no idea but he did intend to find it out. This was getting out of hand. Not to forget the scolding that Lana had received.
These incidents today had made him realise two things, he ached to hear Arya's response, hopefully positive. Yes, he was an extremely patient man and he didn't want to put Arya und
