The former couple, who announced last month that they have called time on their 10-year marriage, apparently clashed over their conflicting attitudes towards fame, reported Contactmusic.
'It was a struggle for Chris to have this movie-star lifestyle. He hated the paparazzi attention. They started to realise they didn't have as much in common as they would have liked. Gwyneth is someone who likes attention. There is a narcissism there," a source said.
It is also believed that Martin and Paltrow, who have children Apple, nine, and Moses, seven, together, struggled to cope with their diverging personalities.