What actions render a marriage irretrievably broken?

Dear Harold,

I have been following media reports on the new Marriage Act 2014 but have been left confused following conflicting reports in the media. From a legal point of view, would you give me examples of what actions constitute an irretrievably broken down marriage and what does it mean to spouses? Nearly all media houses that scrambled to report on the new Marriage Act competed to explain why men could marry other wives without seeking permission and literally left majority of the public groping in the dark over other provisions. {Beth, Mombasa}