not necessarily reylo but what exactly did luke do to ben and how does rey react to it????
Luke had been concerned about Kylo - seen flashes of the darkness, goes to him as he slept one night alone and read his mind - found it filled with darkness, etc.
So Luke moves to kill him, and Kylo wakes up and stops Luke’s downwards swing and then explodes the hut, temple, etc. and leaves him for dead.
Kylo is the one that told her what happened - the truth - and she calls him a liar - but not angrily, more doesn’t want to believe it - I think she trusts Kylo to tell her the truth tbh. She asks Luke and Luke says that’s true, but that he had already decided not to kill him but it was too late - said it was only oninstinct that he ignited the saber - but Kylo was already awake, etc.
Rey then has the thing with her and Kylo in the hut where she’s now convinced he can come back, etc.