Credit: Michael Rozman/Warner Bros.

It's been months since Kelly Osbourne split from fiance Luke Worrall, and the TV star, 25, still hasn't recovered.

"It's been the hardest thing I've ever had to deal with in a long time, and I'm not over it," she says on The Ellen DeGeneres Show Thursday (check your local listings).

Sources told that Worrall was unfaithful. "A small part of me wanted to still be with him, but it's not right," Osbourne tells DeGeneres. "We weren't happy anymore. I had to go to the next step in my life, and so did he."

She tells DeGeneres this split has "sucked way more" than previous ones.

"I was going to marry him," she says. "I wanted to spend the rest of my life with him, and a part of me still really does, but there is a huge part of me that doesn't. "I need a man that's going to stand next to me and say, 'I don't care what anyone else says that's my girlfriend, shut-up,'" she continues. "And not many people will do that."

Single, Osbourne says, "I do not want to date anyone. Although I have been rumored to been dating Chace Crawford. I don't believe I've ever met him. So that's kind of cool."