File photo of Ashton Kutcher and Demi Moore.

London - Ashton Kutcher's former fling Sara Leal expects him to cheat on his new girlfriend Mila Kunis.

 The 22-year-old blonde - who claims to have slept with the 'Two and a Half Men' star in a hotel room on his and ex-wife Demi Moore's sixth wedding anniversary in 2011 - says the 'Ted' star shouldn't trust the 35-year-old actor and thinks the brunette beauty should "definitely keep an eye" on him.

 She said: "Once a cheater, always a cheater. If I were Mila I'd be careful, he doesn't have the best track record. But she's obviously willing to take that risk.

 "If I was dating a guy that had cheated on his wife I would be a little suspicious. It would probably make me extra crazy and extra insecure. I'd definitely keep an eye out.

 "That would be a red flag in my eyes, if I was dating somebody that cheated on their wife.

 "I would hate for Mila to have the same experience as Demi. I wouldn't wish that on anyone.

 "I would just hope that she's secure, and she seems a really smart girl. Everyone's relationship is different so hopefully Ashton won't cheat on her.

 "Hopefully he learned his lesson.

 "I think the fact that they were child actors together and friends before they dated is obviously a good thing."

 Sara insists she didn't know Ashton was married when they had their fling, but she is "sorry" for what happened and thinks Demi - who completed a stint in rehab for a reported eating disorder and addiction issues shortly after they split in December 2011 - coped with the situation "the best way she possibly could".

 She added to The Sun newspaper: "I'm sorry about what happened. I'm sorry to Demi - that's a terrible situation and I'm sure it was really hard. It was never my intention, but that doesn't make it OK.

 "I've been cheated on so I know how terrible that feels. I can't even imagine what it feels like to be cheated on by a husband and have it blow up in your face.

 "My intention wasn't to go out and ruin a marriage. I think Demi handled it in the best way she possibly could." - Bang Showbiz