Arya raised an eyebrow at Armaan, not entirely sure that he wouldn't say something rude and judgmental. But if she said 'no, you can't meet him' then it was as good as saying that maybe Armaan was right. And he wasn't. Besides, Ethan and Armaan would have to meet eventually, once Arya moved in with him. She would want them to get on. There was no way she could keep dating a guy if he and Armaan were going to fight.
There was the power of love, but then there was also not trusting any guy who treated your big brother like crap.
So, yeah, they had to meet.
"We could all go out for dinner," Arya nodded, thinking about it. "But you have to be cool, okay? I am trusting you to be cool. Ethan's a really great guy and I know if you give him a chance you'll see that."