It's a very complicated situation, but the way he talks about missing her only leads Yuya to the next most obvious question. "What did you join the carnival for, anyway?"

If he signed on willingly he probably knew that time wouldn't pass and he was secure here... but then, what was worth him being separated from his wife for so long even for that?

Then again, this is the guy who was letting a Mushi suck on his life force just to see what it'd do, so maybe he didn't need much of a reason at all.