Playing with their feelings would mean he's doing it deliberately, which he's not. He's just not that kind of person. For Sachi, I think at that point in time he was more focused on survival and protecting the whole guild, rather than just one person in it, and he hadn't really settled into the game, whereas by now, he has to a degree. And as for his coldness towards Klein, that's not him being a jerk or anything, I think that's just him feeling guilty for abandoning Klein at the beginning of the game. Which is something that Klein's picked up on, and something he doesn't hold against Kirito anyway, from the looks of it.
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