The openly gay Project Runway mentor, who has been single since 1982, revealed that a particularly bad break-up with his first partner left him feeling reluctant to fall in love again.
"I'm interested. Am I looking? No. I would never say I'll never get into another relationship, but I will share this with you: I feel like I haven't graduated from psycho analysis because I choke when I feel like I'm approaching intimacy with another person," he told Pop Eater.
"It has to do with reliving the break-up of my first serious relationship because it was so horrible. It was just excruciatingly horrible, and I had to keep working with the guy. But things happen for a reason. If we'd stayed together, I would never have moved to New York."
Gunn went on to reveal that he struggled while coming to terms with his sexuality as a teenager.
"I think that's what led to my suicide attempt. I was disgusted at who I was afraid of becoming," he explained.
"Today, there are so many more role models for gay teens and young adults. I'm proud to say I hope I'm one of them."