Twenty-two people were killed and hundreds injured when a bomb was detonated at the end of one of her concerts on 22 May 2017.
Weeks after the attack, Ariana made an emotional return to Manchester to participate in a charity fundraising gig that raised more than £2 million for the families of victims.
"I know those families and my fans, and everyone there experienced a tremendous amount of it as well,” she says in a new interview just published in the British edition of Vogue magazine.
“I feel like I shouldn’t even be talking about my own experience – like I shouldn’t even say anything. I don’t think I’ll ever know how to talk about it and not cry.”
Speaking about suffering from PTSD, she says: "It’s hard to talk about because so many people have suffered such severe, tremendous loss. But, yeah, it’s a real thing."
Last month, to mark the one year anniversary of the horrific attack, Ariana took to Twitter and wrote: "Thinking of you all today and every day. I love you with all of me and am sending you all of the light and warmth I have to offer on this challenging day."

thinking of you all today and every day ? I love you with all of me and am sending you all of the light and warmth I have to offer on this challenging day

— Ariana Grande (@ArianaGrande) May 22, 2018

Speaking last month to Time magazine, Ariana said: “The last thing I would ever want is for my fans to see something like that happen and think it won.
“Music is supposed to be the safest thing in the world. I think that’s why it’s still so heavy on my heart every single day.”