"I just live permanently in a dark place. I just can’t live like this anymore. It’s just too painful," he wrote.
"I had a good run, I’ve done some incredible things in my 44 years and had an unreal life doing what I loved, but all things must come to an end and my curtain has come down for the final time."
The second note was addressed to his ex, actor Ollie Augustin, and in it Robin told him: "I need you to understand that this is not your fault!"
Robin first joined Strictly in 2010, and danced with stars like Deborah Meaden and Alison Hammond. However, he suffered a devastating back injury in late 2013, which required surgery to remove a disc, forcing him to withdraw from the 2014 show. He was replaced by Trent Whiddon, but made an appearance in week nine on 23 November 2014. He also appeared in the 2015 Christmas special.
His former colleague and fellow pro dancer Kristina Rihanoff spoke at the inquest and burst into tears as she recalled how Robin "changed significantly" following his injury.
She also slammed the show as a "very lonely space with not much support".
During his time on the BBC One show, Robin was also partnered with Dragons' Den star Deborah Meaden, actress Anita Dobson, actress Lisa Riley and model Patsy Kensit.
Express.co.uk has contacted the BBC for comment.
