Why Is Freya Attacking Kratos in God of War Ragnarök?

Freya is upset with Kratos when "God of War Ragnarök" begins for reasons that might not be clear to players who have not played the first game.

Freya, God of War Wiki

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God of War Ragnarök Part 1 Freya Attacking Kratos

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God of War Ragnarok - Kratos Vs. Freya Boss Fight (4K 60FPS)

God of War Ragnarok - Kratos Vs. Freya Boss Fight (4K 60FPS)

God of War Ragnarok - Freya attacks Kratos and Atreus