If Luke had been remotely aware of Rey's thoughts or feelings, rather than ascribing the whole thing to his own diseased mind, he'd have assumed that, yes. She was only feeling them because he was the only available person to feel them for. So when she continued on to worry plaintively about his losing interest when he had his real friends, he held up a hand as if to stop her.

"Rey," he said firmly. "You are..." He swallowed. "Very sweet to say something like that. Your concern is unwarranted. I told you before--I am not leaving this island. And even if I did, I..." He shook his head. "Your perception of my... social circle is exaggerated."

The truth was, having her fling such fears at him made him feel all the guiltier about twisting it into something else, something prurient. He didn't deserve this. And if he ever opened himself up to her, she'd know.