Just a few short months ago, Jessica Simpson had her entire future mapped out. She’d marry her boyfriend, Dallas Cowboys quarterback Tony Romo, and start a family, just like she’d always dreamed. But Jessica has not been so lucky in love. Tony dumped her the day before her 29th birthday in July — and now he’s already moved on with 22-year-old local sportscaster Candice Crawford, whom he’s brought to some of the same restaurants in Dallas he and Jessica used to frequent. “She can’t believe it,” an insider tells In Touch. “She doesn’t want Tony back, but no one wants to see that their ex has moved on with a hot, younger girl.” While Jessica’s career is going great — she’s starring in a new show for VH1 called The Price of Beauty — her personal life is kind of a disaster. “This couldn’t have come at a worse time for Jessica,” the friend adds. “It’s opened up a lot of old wounds. She’s pretty insecure about herself." It’s that insecurity that has led Jessica down a dangerous new path — an insider reveals that, in a state of desperation and loneliness, she’s been secretly hooking up with her ex John Mayer, who unceremoniously dumped her in 2007 after they dated for a year.

For the latest on Jessica and John, pick up this week’s issue of In Touch, on newsstands now.