Sounds like a cute book, found it free both on Amazon US and Barnes & Noble.
Amazon:
http://www.amazon.com/My-Boyfriends-...s_154606011_22
Barnes & Noble:
http://www.barnesandnoble.com/w/my-b...riend%27s+back
Overview
"I bring you tidings of... DAMMIT!"
With those few words, Jack Lynch's world would change forever. The nerdy guy from Hammond High has returned for his twentieth reunion. He's rich, successful, and ready to re-claim the girl who got away: Rori McLeary.
There's just one small problem... Jack is also dead. But with the help of an angel in training, his mom, and the rockin' body of his former arch-nemesis, Jack is still going to get the girl.
He has three days to convince Rori to love him. He's got the body he never had, the brains he always had, and Norman the geek angel on his side.
What could possibly go wrong?