hum.... can't vote either of those....
I think Kate would have understood Jack taking the opportunity to leave, particularly as he said he'd be back for her. Its like the raft - if you've got the balls to build it and sail it, then all credit to you - go go go!
I don't think she
doesn't understand what its like to be alone - seems like she's been that way for most of her life (even when she's with someone, she's alone
)