Finn was too tired to be concerned at Rey's tone, but his brain filed it away for a later conversation with her. He really liked her being protective but he wanted to make sure it wasn't also the Dark Side seeping in.
"Ah..." He chuckled and rubbed the back of his neck. "Well...you see...I was kinda trying to leave to warn you about the fleet being under attack and on the run. And Rose... Well she thought I was deserting." Which he was technically. Sort of. He didn't like the idea of leaving Poe behind but Rey mattered more to him. Much more.