After years of watching Real Housewives of New Jersey sister-in-laws Teresa Giudice and Melissa Gorga tear each other apart on national TV, In Touch has learned the real reason why Teresa loathes her brother’s wife — Teresa's husband, Joe, has made the moves on Melissa! “When Melissa started dating Teresa’s brother, Joe [Giudice] would flirt with her and check her out whenever Teresa wasn’t looking,” a close source tells the new issue of In Touch — on newsstands now. “Melissa always told me he was a ‘creep.’ He’s so disrespectful to Teresa, but she turns a blind eye.” According to a friend, Joe secretly loved to praise Melissa even though his wife resented her. “Joe got a kick out of flirting with Melissa. He doesn’t care — he thinks he’s an attractive guy,” says the friend. And that’s just the tip of the bombshell revelations! Though Teresa quickly denied the accusation, former friend Jacqueline Laurita made a shocking confession on the Oct. 7 Real Housewives reunion episode that Teresa once told her she’d caught her husband cheating with the babysitter. For more, pick up this week’s issue of In Touch, on newsstands now!