THIS. He basically just tells her to not take the call, at least for that one night. She needed to LIVE. And I think he could see that, and not just because they were half naked and they BOTH wanted each other so badly.

And yeah, she basically just tells him her brother is unwell. Like...that's not a whole lot to go on there.

And, even though it's sad, he back's off. Now whether that is because the whole situation was now super uncomfortable or because he realizes she see's her brother as more important is up in the air. But that makes it so sad.