Did Ronnie Cheat on His Pregnant Girlfriend on 'Jersey Shore'? We Asked Deena Cortese (Exclusive)

The episode ended with Ron bringing home four women from the club, joining them in the hot tub and taking one of them -- a busty French blonde with no bra and a sheer top -- up to his bedroom. He locked the door behind them, and when Pauly D tried knocking, Ron yelled back, "No, thank you!"

Clearly, he knew what he was doing.

"From what I understand, he didn't [cheat]," Deena told TooFab. "It's still up in the air. He says he didn't, so we really don't know exactly what happened, but he says he did not cheat."

The preview of next week's episode shows the Jersey gang dealing with the aftermath of Ronnie's night: Ronnie's shown crying and calling himself a "d-ck," adding that he needs to "tell Jen." Mike "The Situation" Sorrentino is heard saying, "What the f-ck were you thinking?" Vinny Guadagnino adds, "That girl had no clothes on." And Pauly follows with, "The temptation in Miami's real."

Deena told TooFab she was already asleep by the time Ronnie brought the girl to his room, but she says he says he didn't betray his baby mama.

"None of us know what really happened," she said. "He told us he didn't cheat, but bringing [those girls] home is enough for me to get pissed. I'd go crazy if Chris did that."

And Deena seems to think Ronnie's baby mama, Jen Harley, might react the same way, because when asked if she thought Jen would be pissed watching the episode, Deena said, "Definitely. Definitely. I think any woman would be, and I think Ronnie knows that, too."

According to Deena, Ronnie said he "told [Jen] about everything."

"But it's different hearing it than seeing it, so hopefully they'll be alright," the reality star added. "I don't know Jen that well to say how she's gonna react, so I can't really speak for her. But they have a baby together, so I'm hoping they can work it out."

Regarding Ronnie's obsession with bringing up his ex-girlfriend, Sammi "Sweetheart" Giancola, Deena says it's not mutual.

"The last thing Sam ever wants to talk about is Ronnie," Deena said.

On Thursday's episode, Deena called out Ronnie for allegedly calling Sam from blocked numbers after they broke up. Nicole "Snooki" Polizzi even accused him of still being in love with her, but Deena told TooFab she doesn't think that's the case.

"The fact of the matter is we hadn't lived in that house all together since they were together like 6 years ago, and being in that environment I think brought back old feelings," Deena explained. "Not necessarily that he even has those feelings anymore, but I think he had like a flash of old times."

"Jersey Shore: Family Vacation" airs Thursdays at 8 p.m. on MTV.