""So where would one find out about this 'dark rumour'""
It's all over the Internet.
JA has had relationship after relationship and allegedly wants children, so she's got nothing to feel smug about really. She'd be very sad if she felt smug over a ten year marriage and six children, breaking down. If the rumours are true, she can count herself lucky that she didn't waste time on him.
AJ gets humanitarian crisis in News sources that the masses read, hopefully she won't let this get in the way.