Sandra Bullock -- who briefly emerged from hiding on Wednesday -- knows exactly where she stands with estranged husband Jesse James.
"She has made up her mind," a Bullock friend says in the new issue of Us Weekly, out now. "She is talking to her lawyer and definitely decided to file for divorce from Jesse...She is over him."
Bullock, 45, isn't just taking phone calls from her attorneys. She has also been speaking -- sporadically and furiously -- to her husband of nearly five years.
"When they do talk, it's very little and very nasty," the friend explains. "She won't forgive him for this."
Motorcycle mogul James, 40, has been accused of carrying on affairs with up to five women. On Tuesday, it was reported that he checked himself into Sierra Tuscon, an Arizona rehab which specializes in drug, alcohol and sex addiction, as well as other disorders.
Bullock, meanwhile, has more than just divorce on her mind: she's also thinking about Sunny, her 6-year-old stepdaughter. (Sunny's biological mom is James' ex-wife Janine Lindemulder, a porn star currently in a halfway house.) The actress is determined to remain in Sunny's life, Bullock's friend says.
"Sandra knows there are [legal] obstacles, but she doesn't care...she will fight this with everything in her." (A rep for Bullock tells Us, "She is not pursuing custody of Sunny.")
To read more about the Sandra-Jesse saga -- how young Jesse would torture baby rats, how "none of" Sandra's friends liked him, whether Bullock could feasibly adopt Sunny -- pick up the new Us Weekly, on newsstands today.