Did Heidi Klum's South African ex end it because he was tired of being a 'house-husband?'

They split in January after dating for 18-months, but fresh allegations have now rocked Heidi Klum.

Insiders say her South African bodyguard, Martin Kirsten, ended their romance after being treated like a 'house-husband.'

RadarOnline says a source has confirmed that Martin went from 'having a successful security career to playing Mr.Mom.' "He did everything for the children, from dropping them off at school to putting them to bed at night. He loved the kids, but it was a lot to take on."

Apparently Heidi would be jet setting around the globe and poor Martin had to look after her four children for up to seven days at a time.

Heidi has yet to respond to the claims, but it's reported she probably won't because it's all true.