Yes, this ought to be confusing for Lewis, right? Because he had some sort of problem and Treyen merely smiled.

If the Hufflepuff thought for a moment that Treyen had a solution for all this...well, he's going to be extremely disappointed, because he didn't have one. The only person who could set it all straight would be Kurumi. She was the one who'll eventually make a decision, if there was even a decision to make. It was up to her. Lewis could limit himself to being the awesome Hufflepuff he was, for it seemed to be paying off somehow.

"Because you're blushing." And he was starting to find that extremely amusing. "Because you like her." And there was another reason why he was smiling. "Because it's a great feeling." Even better when the other person liked you back, yet he had no idea if Kurumi liked Lewis for real or not.

Now. Big problem or not, he repeated the one thing he knew to be true. "But it's the only one." Basically, it was best to have one big problem than tons of little ones.

"And it's only a problem if Kurumi really likes you." Was he trying to make Lewis feel better? Because it didn't sound like he was. "If she does like you...then...well, everything is up to her." Yes. He wanted to tell Lewis that he probably had two options: one to fight for her, and the other to stay away from her relationship with Jonathan. But he didn't. Why? "In the end, however, the important thing is that she's happy, no?" Take a hint, Lewis, because that's a question you could ask her.

This is the part where his smile faded. "What concerns you?" That Kurumi didn't like him back? That she'll choose to be with Jonathan instead? That she DID like him and choose him? Because, you know, advices tend to vary depending on what concerns you. And, Treyen could go ahead and tell him to give her time and stuff, but that's not what he truly did with Ellie.