Pretty little lies led to a bonfire of the vanities. That sums up how rich millennials in the Hamptons are explaining the tragic downfall of real estate developer Brandon Miller, who was found unconscious in the garage of his $8 million Water Mill home, leaving behind his social influencer wife Candice Miller and their two little girls. Brandon, 43, the principal partner at Real Estate Equity Corporation, was married to Candice Miller, founder of the lifestyle and mommy blog Mama & Tata and a prominent face on the Hamptons social scene.

He died July 3 after several days at Stony Brook Southampton Hospital where he was taken after being found unconscious in his car — his collection of classic, expensively restored rides included a 1958 Porsche 356A Speedster, a 1971 Ferrari Daytona coupe and a 1968 Ford Bronco. The local fire department was alerted by a carbon-monoxide alarm in the garage. No cause of death has officially been released.

Brandon was thought to be about $17 million in debt at the time of his death, a source told The Post. His wife and young daughters — who had been staying at a luxe hotel on the Amalfi Coast in Italy as part of a lavish trip to Europe that was chronicled on Candice’s Instagram — flew home and were reportedly able to see him before he died. His death laid bare a carefully-curated fairy-tale life, shown to the world on Candice’s Instagram and blog (which have now been shut down), in which he appeared as the lucky and affectionate head of.