Louis C.K. shocked fans when he suddenly quit Twitter late last year -- and now he's finally explaining why.

The fearless comedian laid out his very simple reason for giving up on the popular social networking site during an appearance on SiriusXM’s "Opie Radio."

“It didn’t make me feel good,” the 47-year-old funnyman admitted. “It made me feel bad instead. So I stopped doing it.”

With a little probing from the radio show’s host, the star of FX's "Louie" elaborated on his decision, explaining he often regretted his tweets after sending them into the public sphere.

"I just thought, 'this doesn’t make me feel good,'" he added. “Every time I say anything on here I wish I hadn’t said it. And then I write a couple things to try and fix it and then I feel worse. Any time I tweeted anything I was like, 'Ugh don't like the way that came out.' And then four and a half million people saw it. Like it was the worst things I ever said, heard, and seen by the most people. It's like the worst possible scenario.”

Because C.K. became known for his hilarious, expletive-filled rants on the 140-character format, Opie asked if his decision to leave was aided by Twitter trolls who lashed out against him.

“I don’t give a f--k about that,” C.K. insisted. “Reading it depressed me and writing it depressed me. I hate it, it is everybody’s worst side. When you read it, stuff people say and it’s like ‘Ugh why would you say that?’ It's too instant, I don't think the speed helps dialogue. I think it's why everything is kind of f--ked up and polarizing, because people are going too fast, they're trying to react too quickly.”