The 29-year-old fitness model, who dated Kelly on-and-off for over a year, claimed she mentally abused him and is "incapable" of having a normal relationship, reported Contactmusic.
"Bullying is not about physical strength. It is mental. I am a hard man but when I love someone I let my guard down and people exploit that," he said.
David got engaged to Brook, 35, in 2014. But, just six months later the couple called time on their romance before appearing to get back together on numerous occasions.