Jaffen was awesome. And adorable.
And the answer would be that Kate didn't think it would be appropriate.
I couldn't possibly comment
But even if Jaffen himself wasn't dodgy, he was a member of dodgy race...
That said - it would have been nice to see her get with someone willingly. No mind control, no playing dangerous games.
That's what I was trying to get to. No manipulation...hidden agendas...mind control. Even if it was just a 'dream' moment. Guess 11:59 was closest but that wasn't Janeway