Cue Rey looking utterly miserable at this response. She'd only meant here; it hadn't occurred to her yet that such a bond could persist beyond death. Rather than relieving her, it just makes her more apprehensive of becoming any closer to Kylo than she has. Whatever bond had been between Vader and Obi-Wan hadn't stopped them from being at war. Hadn't stopped Vader from killing his former master.

And the idea that whichever of them survived could still feel the other's presence after death -- she doesn't want either one of them to be left behind to feel the constant reminder of what they'd done, or what they'd failed to do.

She's quiet a long few moments, and then:

"You know Kylo and I are on opposite sides of a war."