Reese Witherspoon Is 'Doing Much Better' After Split from Jim Toth (Exclusive)

Following her breakup with Jim Toth, Reese Witherspoon is looking forward.

More than three weeks after the pair announced they made the "difficult decision to divorce" in March,

a source tells PEOPLE that Witherspoon, 47, "is just focused on her kids and work," even though the decision to divorce Toth, 52, was "not an easy one."

"She did not find it simple to decide to get divorced. Making the decision and announcing it was difficult,

the source claims. However, Reese is doing much better now.

She is only concerned with her children and her job and has no regrets.

Tennessee James, a 10-year-old boy, is shared by Witherspoon and Toth, and Ava Elizabeth, 23, and Deacon Reese, 19, are shared by the Legally Blonde actress and her ex-husband Ryan Phillippe.