The actor, 31, shared a slideshow of photos on Sunday from when he was hospitalized last year following a drug and alcohol bender. In the pics, Haynes is seen hooked up to machines, laying on a hospital bed, and in one particular photo in a bathroom, with bruises on his back.
"Throwback. I don't want worrying about if I look hot or not on Instagram to be my legacy," he began. "I don't want to skirt around the truth to please other people or to gain economic success. I have far more important things to say than what magazine I just shot for or what TV show I'm a part of (Although I'm very thankful I still get to do what I love)."
"I no longer want to project a curated life," he added.
The "Arrow" star went on to express how much it means to him when he has helped other people suffering from mental health and addiction issues.
"I get immense joy when someone comes up to me & says that my willingness to open up about depression, anxiety, alcoholism, & addiction has helped them in some way," Haynes wrote. "I've struggled the past year with trying to find my voice and where I fit in & that has been the most beautiful struggle I've ever had to go through. Worrying about what time to post on social media so I can maximize my likes or being mad at myself that I don't look the same way I did when I was addicted to pills is a complete waste of why I was put on this earth."
"I'm posting these photos to let y'all in on my truth," he concluded. "I'm so grateful to be where I am now (a year after these photos were taken) but man these times were dark. I'm a human being with flaws just like you. If [you're] in the middle of the dark times...I promise you it doesn't have to last forever. Love y'all.”
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The "Teen Wolf" star's powerful message was met with support from many celebrities, who took to the comments to applaud Haynes post.
"Love you so much!!!! Couldn't love you more. Brave, Kind and the Real Deal you are my friend," wrote "RHOBH" star Lisa Rinna. Tennis pro Serena Williams commented, "I'm so proud of you."
Haynes' former "Teen Wolf" co-star, Tyler Hoechlin, wrote, "Brother I couldn't be more proud of you and where you've arrived in this journey through life. Thank you for bravely sharing this, I know it will help many, and even it was only 1, that would be enough. It's been a joy to see you reach this place in your life. Love you bud.
"This is beautiful. [Love] you," Brittany Snow commented and Lucy Hale added, "I love you" with a heart emoji.
Haynes opened up to Attitude magazine back in March about an extremely dark period in his life that resulted in him being put under a 5150 psych hold following a bender at a Beverly Hills hotel. According to Haynes, who has struggled with drug and alcohol addiction in the past, said he began to go down a "downward spiral" after he came out as gay in 2016.
"I came out and, in a way, my downward spiral started," he told the mag. "I felt extremely free but at the same time the amount of attention I was getting was making me spin out of control. I got married and that didn't work out. That was extremely public and heart-breaking, and right when that was going on, my mom died. That was only a year ago. At that point, I fell apart. My brain broke."
Luckily Haynes seems to be in a better place now and hopes to continue to help those who are battling addiction.
"I'm always going to be in recovery," he said at the time. "There are so many people struggling out there, but not a lot of them talk about it. Life is much more beautiful than I could have imagined. It's just a different life now. It's the best gift I've ever been given."