Jersey Shore's Ronnie Ortiz-Magro says he doesn't regret hooking up with so many women behind on-and-off girlfriend Sammi Giancola's back.
"I regret getting caught," he said on MTV's after-show special Thursday. "I don't regret having a good time. I regret getting into bed with Sammi after I got home. That was my downside."
Looking back, Giancola, 22, said his behavior was "sickening" and "disgusting."
So why didn't she believe it when her roommates slipped her a note detailing Ortiz-Magro's wild ways?
"I don't think I wanted to believe it," she said.
She said she was so "blind" to his behavior because she felt alone in the house; he was the person she felt the most "comfortable with" and didn't want to lose that.
"I feel embarrassed now," she said. "I feel like I just leeched on to the person who was hurting me."
Now back on with Giancola, Ortiz-Magro, 23, insisted his wild days are over.
"I've learned a lot watching the show," he said. "I have something good. I have an amazing girl, and she doesn't deserve to be treated that way."
Giancola said she believes him.
"I think he is actually really trying to show me the good instead of the bad," she said. "That's what I hold on to all the time."
As for her physical fight with Jenni "J-Woww" Farley (teased at the end of Thursday's episode)?
Both reality stars blame it on tensions stemming from Ortiz-Magro: Giancola was upset Farley, 23, didn't tell her about Ortiz-Magro's behavior; Farley said she didn't want to jeopardize her friendship with Ortiz-Magro.
Said Farley, "There was a lot of s--t talking, and we just had to get it out."
"I felt they were backstabbing me," added Giancola. "For my first fight, I thought I did OK."