Kate Cassidy wrote that her ‘heart is shattered’ after the One Direction star died on Oct. 16

Liam Payne and Kate Cassidy. Photo: Samir Hussein/Getty

Liam Payne’s girlfriend Kate Cassidy is sharing one of the final letters the One Direction singer wrote before his death on Oct. 16.

On Oct. 23, the 25-year-old influencer posted several sweet photos of her with Payne on Instagram, revealing that she and Payne “manifested our lives together” a few weeks before his death.

In her tribute, she shared a sweet note the singer wrote that revealed his intentions to get engaged and married within the year. “I keep your note close, even though you told me not to look at it. It said, ‘Me and Kate to marry within a year/engaged & together forever 444,'” she wrote in a message featured in the gallery.

“My heart is shattered in ways I can’t put into words,” she continued. “I wish you could see the huge impact you’ve had on the world, even as it feels so dark right now.”

“You are — because I can’t say were — my best friend, the love of my life, and everyone you touched felt just as special as I did,” Cassidy wrote. “None of this feels real, and I can’t wrap my head around this new reality of not having you here. I’m struggling to figure out how to live in a world without you by my side. Together, we got to be kids again, always finding joy in the smallest things.”

She concluded the post by expressing her love for Payne. “Liam, I know we’ll be together forever, but not in the way we had planned,” she shared. “You’ll always be with me. I’ve gained a guardian angel. I will love you for the rest of my life and beyond, carrying our dreams and memories with me everywhere I go.”

Kate Cassidy/Instagram

The tribute follows her initial statement shared on her Instagram Stories on Oct. 18, in which she thanked everyone “for all of the kind words and love that has been sent my way.”

She expressed that she was at “a complete loss” over Payne’s death and asked fans to give her “grace and space to navigate this in private.”

Payne and Cassidy were first spotted together back in October 2022. While the pair mainly kept their relationship out of the spotlight, Cassidy shared glimpses of their romance through several casual photos and TikTok videos they made together.

Kate Cassidy and Liam Payne.Kate Cassidy/Instagram

PEOPLE confirmed that Payne died after a multi-story fall from a balcony at the CasaSur Palermo Hotel in Buenos Aires, Argentina on Wednesday, Oct. 16. According to a preliminary autopsy report, the singer died after he sustained multiple “internal and external” injuries after falling from his balcony.

Kate Cassidy and Liam Payne.Kate Cassidy/Instagram

On Monday, Oct. 21, a partial autopsy revealed that the singer had “had multiple substances in his system,” per ABC News, including “pink cocaine” — a combination drug that includes methamphetamine, ketamine, MDMA and caffeine and may not always contain cocaine, per the National Capital Poison Center.

As of Oct. 23, Liam Payne’s father, Geoff Payne, is currently cooperating with Argentine authorities amid their ongoing investigation into Payne’s death.