He certainly has ego problems and treated his ex appallingly. Besides the rumoured cheating claims when he was on Striclty, there was a few things afterwards and before he came out and announced split publically he had only just been on a family holiday. How he announced it was like it was about to be leaked about an affair so they decided to announce split to make it sound better. His arrogance in swimming terms is on another level, yes he is good but its one event for one distance, not exactly Michael Phelps level, there was some interviews at the time of the commonwealth games when he didnt win/qualifying fastest saying 'its only the commonwealths' been openly disrespectful to his teammates.
Also he spent a good few months swanning around Australia late last year, early this year. You'd think with a young child you would want to spend some of the magic with them for Christmas, but instead he let his ex solo parent for months on end, while he relaxed on holiday. Most of the other British swimmers rushed home after the comp but he stayed out there for months.
Eiri the ex, did post something about the months after he left been the happiest of her life, so maybe he is more than hard work