The comedian was left disgraced when he was pictured snogging his dance partner Katya Jones on a drunken night out behind both his girlfriend and her husband's backs.
Now in a new interview to be aired on Saturday night's Jonathan Ross Show, Seann has acknowledged the hurt he caused actress Rebecca.
He said: "Obviously I was stupid and I was selfish and I was hurtful to someone that I cared about and someone that I respected, and I still care about and still respect.
"I will always be sorry about what I did. I think when it all blew up, I don’t think I reacted in the correct manner.
"I didn’t know what to do, it was huge. It has been some time since then, I have had a lot of time to look at my actions, look at my behaviour and take responsibility as well.
"I think when you have gone through something like that, you end up thinking in cliches, like, 'If I could go back in time, I’d behave differently and treat her differently', but unfortunately all I can be is as sorry as I am and as regretful as I am."
Sean added: "The thing is, especially with how public it was, if you behave the way I did privately, that is inexcusable enough but for it to go so public, that was all my fault."
He also finally acknowledged Rebecca's statement at the time which said he had behaved "aggressively" when she confronted him over his relationship with Katya.
Seann admitted putting Rebecca through "a form of abuse" saying: "I think that when I first saw that statement it was so huge and you go through a mixture of emotions and I didn’t really know how to react.
"But I think with the time that I’ve had, that actually she is right, I think everything she said in that statement is right."
He added: "At first it's denial, initially you look at that and you go, 'No absolutely not'. But with time, someone that you cared about has written that about you and posted that and I think that actually, yes she was right what she said.
"And I think if you lie and cheat on the person that you’re meant to care for and be in a relationship with, then that is a form of abuse, of course it is.
"All I can be is as sorry as I am. I hope one day that she’ll forgive me."
* The Jonathan Ross Show airs on Saturday at 9.25pm on ITV
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