Is much rather have a romance between those two than with Kylo
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Oh, I don't buy for a second that Rey is going to have a romance with Ben. I think, rather, that she understands him on a deeper level than most because of their shared experiences, and because in a weird way, they share the same personal difficulty of navigating their own identities, especially with respect to their relationship with the Force.
I've mentioned this elsewhere (I think in this thread?) but I think Rey and Ben are kind of mirror images of each other in terms of their journeys. They were both abandoned by their parents in a sense. Rey on Jakku, and Ben to the Jedi temple. Their paths were both dictated to them: Rey's by circumstance of just needing to survive; Ben's by virtue of all the expectations on him as the son of two heroes of the Republic, and the nephew of the leader of the Jedi (and later as the grandson of one of a Dark Lord of the Sith). Neither has ever really had choices in their lives in terms of determining their own identities or paths.
Where they part company is in two ways: (1) how they relate to the past, and (2) how they choose their paths in response to that relationship with the past.
For Ben, the past gave him an identity that he never wanted or chose. Ben wants to free himself of the "destiny" foisted upon from birth (I suspect) and so chooses to burn down the past. My guess is that he believes he can rebuild the galaxy -- and himself -- anew, once the past is destroyed. (Hint: that's not possible. You can never escape the past, and it's part of what makes Ben such a tragic figure, almost in a classical "Greek Tragedy" sense, actually.)
Rey looks to the past to provide her with an identity, which is exactly the opposite of what Ben does. Where Ben wants to escape the past so as to free himself from it, Rey is actively searching the past to provide her with exactly the kind of path, identity, and destiny that Ben has rejected. Instead, Rey finds nothing there but what she already knew: she is Rey. Her remarkableness in essence springs from nothing. She has no parentage of note. She's not part of any bloodline. She's just...Rey. And Rey chooses not to destroy the past, but to focus on protecting the present, while acknowledging the past too (as evidenced by her taking the Jedi texts with her).
What I find so interesting is how -- at least in TLJ -- each character wants what the other has initially. Rey
wants to be part of a legacy. She
wants there to be an easy answer as far as "Who am I and what am I to do?" Ben, on the other hand, wants the very freedom that Rey has; he wants to have
no legacy, to have
no past, and he's willing to let the galaxy burn to reach that goal. (Never mind that he's basically just following in his Grandfather's footsteps anyway by choosing that path.)