A source told The Sun newspaper that Danny was finding things difficult as they were in different places in their life as he is so much younger and "she has kids".
The source said: "They decided to go their separate ways. It was mostly his doing. Kirsty was devastated but agreed it was for the best.
"She and Danny were intense for a while but it became difficult. It didn't help that he's younger and she has kids."
Sale Sharks fly-half Danny has a long romantic past with women that are older than him.
He previously dated Kelly Brook, 36, Katie Price, 37 and actress Lindsay Lohan, 29.
Kirsty was warned off the athlete by her former spouse because of his womanising reputation, but she was never put off by Danny's history with women.
A source close to Kirsty said: "She wasn't put off by his reputation. Kirsty was devastated but agreed it was for the best."
The source said: "They decided to go their separate ways. It was mostly his doing. Kirsty was devastated but agreed it was for the best.
"She and Danny were intense for a while but it became difficult. It didn't help that he's younger and she has kids."
Sale Sharks fly-half Danny has a long romantic past with women that are older than him.
He previously dated Kelly Brook, 36, Katie Price, 37 and actress Lindsay Lohan, 29.
Kirsty was warned off the athlete by her former spouse because of his womanising reputation, but she was never put off by Danny's history with women.
A source close to Kirsty said: "She wasn't put off by his reputation. Kirsty was devastated but agreed it was for the best."
