What can my brother do to get his wife's forgiveness?

Anonymous
He had an affair with a co-worker 4 years ago but his wife found out about it last month.
They got a 5 year-old daughter but all his wife wants now is divorce. She wants it done ASAP. My brother wants to stay and work it out. She doesn't. What else can he do to get her forgiveness?
Updates:
10 mo
My brother said she won't reconsider, not even when he mentioned they got their daughter. When he said that, she got more upset. He wants to do if there is anything he can do to make her forgive him.
What can my brother do to get his wife's forgiveness?
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