'RHOP' Star Mia Thornton's Estranged Husband Says She Married Him For Money

Mia Thornton's soon-to-be ex-husband, Gordon, is blasting the 'Real Housewife' for ditching him now that he's in financial trouble -- a sure sign, he says, she was gold digging when she said "I do." Gordon Thornton tells TMZ ... Mia only tied the…