It was important. It had been a very important moment for Rey which started their journey to where they were now. She was visibly shaken by digging up all those things but felt it only fair that he knew of them.
She watched him carefully, being unable to feel how he was reacting to things. It would have been easier to feel him out with the force and flow with his feelings, but now there was this disconnect. It was hardly fair, but... "And in Bug Land, when he healed me. I learned how he did it." There wasn't a flow of visions, there wouldn't be unless he pressed for it, because she was talking now, fueled by an intense apprehension and need to push through it.
"In our future, I fight Palpatine. I win but I died and Ben brought me back." She wasn't looking at his face, but his hands, but hadn't stopped talking. No, she just barrelled through afraid she'd not get it out if she stopped. "You don't just fix someone. You have to use your life force to heal. That's why he was so weak after he healed H-" The hesitation on the name was clear. She'd never said it before, but he wasn't Hux anymore, and calling him Dameron would just be weird. "Armitage and me."
Her grip on him hand tightened. "That's how he died."