If he's given you something that no one else has been able to, I would say the bias is reasonable.

[Kaoru wonders briefly if it might be possible to ask for Chizuru back, too, since only LILITH had been remotely helpful there and she's pretty dead or something now.]

Ah? [This isn't a situation Kaoru would know how to handle either, honestly, so at least it makes sense... What does one do after achieving revenge?? Set a new revenge goal, obviously.]

I see... Does that bother you? Do you mind it? Finding a new purpose would be a much simpler feat than sitting with nothing to stride toward, I would think.