In his upcoming memoir, Proud, former Welsh rugby star Gareth Thomas discusses the pain he felt when his wife left him after he revealed to her that he's gay.

Proud is published by Ebury Press and ghost written by sportswriter Michael Calvin.

Thomas, who retired from rugby in 2011, publicly acknowledged he is gay in 2009. The 40-year-old Welshman's coming out inspired other professional athletes to come out, including English cricketer Steven Michael Davies and Swedish footballer (European soccer) Anton Hysen.

Ebury Press called the memoir “an incredible story of one man facing up to the truth with no idea of the impact it will have on his life.”

In 2006, Thomas confessed to his wife of 5 years, Jemma, that he's gay.

The night she left him, Thomas writes in the book, he attempted to drown himself in his swimming pool.

“I missed her so badly, and hated myself for what I had inflected on her,” he wrote.

Thomas is currently in a relationship with boyfriend Ian Baum and his former wife has remarried.