Ryan Giggs threw his girlfriend out of a hotel room naked.
A man is on trial accused of controlling behavior and abusing his former girlfriend and her sister.
Ms Greville told detectives that Mr Giggs was her best friend and her soulmate but he became abusive and nasty.
The man has denied all the charges.
He is accused of coercive behavior against Kate Greville.
He is accused of attacking Kate Greville and Emma Greville at his home in Greater Manchester.
The former Wales manager was accused by Ms Greville of headbutting her.
She told detectives that Mr Giggs "flipped" in a hotel room after she confronted him about her texting habits.
She said he dragged her naked across the floor and threw her and her belongings into the corridor after squaring up to her.
Ms Greville said that she felt humiliated and embarrassed.
She said that she saw early red flags in their relationship and it was almost like he was two people.
She claimed to have found evidence that Mr. Giggs had had relationships with eight other women.
She told detectives that she was unhappy with her marriage and that she was controlling it.
She said that he would tell her about his unhappy marriage.
She left her husband two months after that.
She said that he was the one who saved her from that marriage.
She said Mr Giggs promised to leave his wife after she ended her own marriage, but it never happened.
She stopped talking to him and ignored his calls.
Ms Greville told police that he yelled "You are a whore" after she ignored him. Did you get someone in there?
She said that he threatened to tell her boss about their affair.
Ms Greville lied about her relationship with the married man because she was ashamed.
She said that she was told the marriage was over but she found out it was not.
It was a mind game. She said that it went on for a long time.
The court heard that the affair became public in May 2016 and that she was hounded by the police.
The court heard that she was blocking him on her phone and emails.
I was so in love with him. She said she couldn't get him out of her mind.
She said Mr Giggs wanted more time to end his marriage.
Ms Greville said she moved to Abu Dhabi to escape him after she gave him an ultimatum.