Katie announced that she is pregnant earlier this week, however a series of tweets and an official statement explained the split and included allegations of an affair.
Now Alex, who separated from the former glamour model in 2011, has offered her a shoulder to cry on.
Speaking to MailOnline, Alex described the situation as “terrible”, adding that Katie had issues with trust during their own relationship.
Since Katie accused Kieran of having a “seven-month affair” with her best friend Jane Pountney, she has been spotted arriving at Jane’s house, where she remained for approximately three hours, according to reports.
“There has not been a ‘full blown’ affair going on, it was more like a drunken kiss,” he said.
“Now Katie has gone and put the whole thing for everyone to read about on Twitter, which she didn’t really need to do, and a drunk kiss has turned into a full-on affair.
“That’s not the case. I knew about what had happened before today, it’s not new to me.”