The Friends reunion was even more emotional than what we saw on our screens.

In a new interview with The Hollywood Reporter, Jennifer Aniston opened up about revisiting the set of the hit ’90s sitcom with her former costars earlier this year, admitting that the reunion unexpectedly made her confront “the hardest time” of her life.

“I think we were just so naive walking into it, thinking, ‘How fun is this going to be? They’re putting the sets back together, exactly as they were.’ Then you get there and it’s like, ‘Oh right, I hadn’t thought about what was going on the last time I was actually here,’” Aniston told the outlet. “It just took me by surprise because it was like, ‘Hi, past, remember me? Remember how that sucked? You thought everything was in front of you and life was going to be just gorgeous and then you went through maybe the hardest time in your life?’”

She went on to add that she had to walk out of the reunion while they were filming. “It was all very jarring and, of course, you’ve got cameras everywhere and I’m already a little emotionally accessible, I guess you could say,” she said. “I had to walk out at certain points. I don’t know how they cut around it.”

When asked what she thought her life would be like after the show ended, Aniston said her personal life had “shape-shifted.”