Sorry, Levi, it's really over this time. The on-again, off-again romance between Sarah Palin's oldest daughter, Bristol and Levi Johnston, 20, has gone belly up for good, less than three weeks after they announced they were engaged.

Bristol Palin, Levi Johnston Are Engaged!July 14, 2010
Bristol Palin and Levi Johnston reveal exclusively in the new Us Weekly that they are getting married.
 
And, they tell Us Weekly, former vice presidential candidate Sarah Palin has been kept in the dark about their plans ... until now.
 
"We got engaged two weeks ago," Bristol, 19, tells Us Weekly. "It felt right, even though we don’t have the approval of our parents."
 
 
Bristol and Levi, 20 -- who famously called off their previous engagement two weeks after welcoming son Tripp in December 2008 -- tell Us Weekly they reconnected three months ago while working out a custody plan for their 18-month-old son.
 
"I really thought we were over," Levi tells Us Weekly. "So when I went, I had no hope. I think we both just started talking — and then we took Tripp for a walk."
 
Says Bristol, "When he left that night, we didn’t hug or kiss, but I was thinking how different it was. He texted me: 'I miss you. I love you. I want to be with you again' ... I was in shock."
 
Now comes the hard part: Getting the blessing of Sarah Palin, who has made no secret of her feelings for Levi. He provoked her fury last fall when he claimed that she had called her infant son Trig (who has Down syndrome) "retarded." She fired back, telling reporters that anyone who posed for Playgirl would "say and do anything for even more attention." Later, during an interview with Oprah Winfrey, she dubbed him "Ricky Hollywood" and called his "aspiring porn" career "heartbreaking."
 
Says Bristol, "It is intimidating and scary just to think about what her reaction is going to be. Hopefully she will jump on board."
 
The Palins released a statement on the Today show Wednesday morning: "Bristol at 19 is now a young adult. We obviously want what's best for our children. Bristol believes in redemption and forgiveness to a degree most of us struggle to put in practice in our daily lives."
 
Bristol Palin to Levi Johnston: 'It's Over'
08/04/2010
And just like that, they were off again. "It's over. I broke up with him," Bristol Palin tells PEOPLE exclusively of her second try at an engagement to Levi Johnston, father of her 19-month-old son Tripp.
 
Palin, 19, says the relationship soured on July 14, the very same day they announced their marriage intentions to the world. Palin says he told her that evening he might have fathered a baby with another teenage girl. (Palin did not name the young woman, but a pregnant former girlfriend of Johnston's has since publicly denied his paternity.)
 
In an emotional phone interview with PEOPLE, Palin spoke through tears about feeling heartbroken, humiliated and trapped – while Johnston acted cool. "There's been no remorse," she says, adding that she's seen him only once in the past three weeks.
 
"The final straw was him flying to Hollywood for what he told me was to see some hunting show but come to find out it was that music video mocking my family," she says. "He's just obsessed with the limelight and I got played."