"This is a perfect, like, there could not be a more perfect example of what I've been trying to share and teach than this actually coming out about me," he says. "The biggest problem that people have with their entire fucking existence is very simply described as this: You do not have the ability to stick to what you said you're going to do when it gets mildly uncomfortable." The show will air Sunday at 9 p.m. ET on TLC.