Why would a man take his children to meet his lover?

They’ve been having an affair for 3 years, the man wanted to leave the wife for her, but the lover didn’t allow him, because she didn’t want to break the family and ruin the life for his children and a wife.
Three years later, the man brings his children to her and spends a whole day there with her. Why?
It’s not from my life.

Why would a man take his children to meet his lover?
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