Why does Enrique's father move out?

Enrique's father meet another woman and wants to start a new family. His new wife, however, considers Enrique a financial burden.

When Enrique is seven, his father brings a woman home. To her, Enrique is an economic burden. One morning, she spills hot cocoa and burns him. His father throws her out. But their separation is brief.

“Mom,” Enrique’s father tells the grandmother, “I can’t think of anyone but that woman.”