Picasso was fighting with his wife Olga. A particular period when he was with her was the worst time of his life, he said. And he showed it in his art.
That’s what art is. A representation of the reality and an attempt at connecting the dots, understanding the forces that are omnipresent and ever-present.
Artists always portray themselves in their art. They become naked. It’s how they display their emotions (often force negative emotions out of their system) I guess, but it’s also their dialog with the universe.