Daily Star's biggest headlines straight to your inbox!Meghan Markle may struggle to hold onto her husband – after boffins revealed a good relationship with the in-laws keeps couples together.According to a new study people think how partners get on with their friends and relations is most important in cementing long-term relationships.They place more value on in-law interaction than sex and money.That could spell misery for the mum-of-two who walked out on the monarchy for a new private life in an £11million US mansion.She accused the Royals of ignoring her mental health woes and racism.Her 36-year-old hubby Prince Harry plans to write an explosive book about their experiences.But according to findings by the University of Nicosia in Cyprus.
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