Tracey Emin’s new husband may not talk much or do the ironing, but when it comes to fidelity, he’s a rock. Really, he’s a rock. No, you don’t understand. Her husband actually is a large lump of rock.As her latest exhibition I Cried Because I Love You opens in Hong Kong, the woman whose life is her art has revealed that last summer she married a venerable stone that stands in her garden in France.