Sharing a screenshot of a note, the Saturday Night Live star, 25, wrote, “I really don’t want to be on this earth anymore. I’m doing my best to stay here for you but i actually don’t know how much longer i can last.”
“All i’ve ever tried to do was help people. Just remember i told you so,” he continued, adding a single red heart emoji.
Davidson, who shared the post without a caption, later deleted his Instagram account.
Reps for Davidson and SNL did not immediately return PEOPLE’s request for comment.
Following Davidson’s post, his ex Ariana Grande shared in since-deleted tweets that she wanted “everyone to be healthy and happy.”
“Man i’m so sorry i told a dumb joke. i really didn’t mean any harm,” she tweeted. “All I want everyone to be healthy and happy. so desperately. please. my god.”
“I’m downstairs and I’m not going anywhere if you need anyone or anything,” she added. “I know u have everyone u need and that’s not me, but i’m here too.”
A public information officer with the New York Police Department tells PEOPLE they sent officers to do a welfare check on Davidson. TMZ was the first to report the news.
Musician Machine Gun Kelly, another Davidson pal, also shared a message on Twitter, writing that he was on his way to see Davidson and “make sure he’s good.”
“Im in the plane now on the way to see Pete. gonna make sure he’s good, i promise,” he wrote. “Can’t have my boy in the darkness like that.”
“Bravo Kanye West for standing up for yourself and speaking out against mental health,” Davidson, who has borderline personality disorder and has previously spoken about the negative effects bullying has on his illness, wrote on Instagram.
“I can’t explain to you enough how difficult and scary it is to be honest about stuff like this. We need people like Kanye,” he continued.
Although Davidson did not address Grande by name, he added, “No one should ever point finger at you for your bravery in speaking about mental health. I’m seriously disgusted.”
On Saturday morning, West, 41, addressed a tweet Grande shared earlier this week, hours before she dropped her new song “Imagine.”
“Guys, i know there are grown men arguing online rn but miley and i dropping our beautiful, new songs tonight so if y’all could please jus behave for just like a few hours so the girls can shine that’d be so sick thank u,” she wrote on Thursday.
“I know Ariana said this to be cool and didn’t mean no harm but I don’t like even slightest level of slight commentary from someone I know loves and respects me,” West tweeted.
Emphasizing that people need to stop treating “mental health” like a joke, he briefly outlined what led him to come after Drake online this week. (Months after telling the world that he suffered from bipolar disorder, West said in October that he was “misdiagnosed” with the condition.)
The topic of feeling attacked because of mental illness is close to Davidson’s heart.
Days after Grande dropped the music video for “Thank U, Next,” which references the couple’s whirlwind romance and split, the SNL star penned a lengthy note about the way Grande’s fans had bullied him.
“I’ve kept my mouth shut. Never mentioned any names, never said a word about anyone or anything,” Davidson wrote on Instagram. “I’m trying to understand how when something happens to a guy the whole entire world just trashes him without any facts or frame of reference. Especially in today’s climate where everyone loves to be offended and upset it is truly mind boggling.”
“I’ve been getting online bullied and in public by people for 9 months. I’ve spoken about BPD and being suicidal publicly only in the hopes that it will bring awareness and help kids like myself who don’t want to be on this earth,” continued Davidson.
He concluded: “I just want you guys to know. No matter how hard the internet or anyone tries to make me kill myself. I won’t. I’m upset I even have to say this. To all those holding me down and seeing this for what it is — I see you and I love you.”
Grande went on to ask her fans to be kinder to Davidson, whom she still feels “irrevocable love” toward.
“I know u already know this but i feel i need to remind my fans to please be gentler with others,” she wrote alongside a screenshot of Davidson’s post. “I really don’t endorse anything but forgiveness and positivity. i care deeply about pete and his health.”
“I’m asking you to please be gentler with others, even on the internet. i’ve learned thru my own mistakes not to be reactive on socials so i do understand,” Grande continued. “but you truly don’t know what anybody is experiencing ever. regardless of what they choose to display on social media or how they may appear in public. i can promise u that.”
“So please let whatever point you’re trying to make go,” she urged. “I will always have irrevocable love for him and if you’ve gotten any other impression from my recent work, you might have missed the point.”
If you or someone you know is in need of crisis or suicide prevention support, please call Lifeline on 13 11 14 or visit www.lifeline.org.au/gethelp
This story originally appeared on PEOPLE.