The 32-year-old is said to have broken up with Natasha Gascoine just nine months after the couple married, but according to his wife, the sportsman has begged for her to take him back.
Gascoine hit out at Powell by posting the text messages online, while the 25-year-old has also put a number of the rugby player's possessions, including his wedding suit, up for auction on eBay.
Gascoine appears to have received a lot of support on the social networking website, and after one Twitter user asked what Powell had done wrong, she replied: "cheated. Lied. Cares to much about gambling and alcohol after after I was going through my own physical pain."
Powell switched codes to rugby league last year.