It's because they flat-out lie and embellish everything and anything they've ever said about their lives. He does a very quick edit, does not really listen back to what he's said, and he probably rambles on so much that he completely forgets as soon as he's said it. What he does not understand, even after all these years, that the internet does not forget. We can watch things, refer back to them. The internet is forever.
He lied about having a horrible childhood, when in reality, he had a loving family, living in a nice home, going on plenty of foreign holidays. Not something every 80's kid in Ireland could say. Yes, his parents broke up, but that happened to plenty of families. His parents still took enough interest in him and his issues to send him to a different school, where he said he learned so much about himself and how to handle himself with 'the invisible friends'. Of course as an adult he still talks to invisible friends......
When he tried to jump on the 'me too' bandwagon, his former bandmate said that Jonathan was using some of HIS life to make it sound better. He said Jonathan always pretended to be someone he wasn't. So he's done this all his life, and thinks nothing of it.
I very very much doubt we will ever get to see 'the real Jonathan'. This is yet another stunt he pulls. I feel sorry for his kids.