Michael Costello says Chrissy Teigen's online bullying left him depressed and suicidal.
Costello, 38, issued a statement accusing Teigen of spreading fake photos and racist rumors about him on social media in 2014.
The Fashion designer is best known for his appearance on the eighth season of Project Runway.
Costello's accusations came hours after Teigen apologized a second time for cyberbullying Courtney Stodden and others.
"I didn't want to do this, but I can not be happy until I speak my mind," he wrote in a lengthy post on Instagram.
"I need to heal and in order for me to do that I must reveal what I've been going through. I wanted to kill myself and I still am traumatized, depressed, and have thoughts of suicide."
"When I reached out to Chrissy Teigen to communicate that I was the victim of a vindictive cyber slander and that everything she thought I was is not who I am, she told me that my career was over and that all my doors will be shut from there on."
Costello also shared screenshots of DMs he sent Teigen begging her to stop saying he called someone a racial slur.
However, fashion designer Maxie James accused Costello of calling her a "Black ni**er b*tch" when they bumped into each other in a fabric store.
James also admitted she nearly "whooped his a**" and almost went to jail.
"Whew one thing about that karma boy! it aaaaalways finds its way back around! even if it’s 7 years later! Michael Costello got the nerve to be playing victim of being bullied, but called his self bullying 7 years ago and called me a Black N****r B*** in a fabric store downtown. He had the wrong one tho cus I most certainly whooped his a** and almost went to jail too. Thank GOD for his mercy us I seriously LOST IT. I never experienced racism before. All I knew to do was FIGHT."