Tom is said to have moved out of the family home he and Tamzin share with daughters Florence, four, and one-year-old Marnie Mae. The couple are determined to stay on good terms for the sake of their children.
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Tamzin, 42, was spotted without her wedding ring last week. She is said to have removed it after 34-year-old Tom admitted to straying while he was filming Gothica in the US.
Reps for the couple confirmed the split last week, saying the pair will "remain friends".
The EastEnders stars married in 2006, a year after they were introduced by mutual friend James McAvoy.
It was only in March of this year that Tom spoke lovingly about the moment he met his future wife.
"My life changed in 2005 on the day I met my wife, Tamzin Outhwaite," he wrote on the Mail website.
"She was in a play called Breathing Corpses with James McAvoy, one of my best mates from drama school. I knew who she was and I'd fancied her quite a bit when she played Melanie Owen in EastEnders."
After spotting her in a bar a few days later, Tom – who has a daughter Nora from a previous relationship – revealed that they "chatted together for the rest of the night".
He continued: "I gave her a lift home and told her I'd love to see her the next day… After just a couple of weeks, I already knew she was the person I wanted to spend the rest of my life with."