From another BBC article written in September:
I ask him what the hardest part of the journey has been, but instead of talking about blisters or fears about crime, he says: "It's the relationships. I've fallen in love twice, lost them, and that leaves marks.
"The physical pain stuff – yeah, that's all doable. In terms of falling in love and then having to just carry on the walk? You're going to lose it.
So - missing seeing your child grow up into an adult isn't the hardest part?!
From a guardian article:
Once Bushby had made up his mind, he accepted that he would never see his son growing up. If everything went to plan, Adam would be 20 when he got back (as it is, he is 36).
“That was a difficult decision,” Bushby says. “But the way I squared that circle was, ‘How would I be worth something to my son?’ Would I be worth more to him by doing something on this scale?’” He doesn’t sound wholly convinced by his argument
And...
Bushby says he has led a selfish life. When he set off, he knew that if either of his parents died while he was away, he would not return for their funeral. When his son, Adam, almost died in a motorbike accident, he didn’t return home. He tells me he’s got a 12-year-old granddaughter he is yet to meet
And...
Totally self-centred,” agrees Bushby. “This 28 years has been about keeping me. I have been the centre of my world. It has been about getting me from A to B, looking after me, giving me the money so I can survive. Totally self-centred.”
So, we don't need to speculate really. He's fully admitting he's a selfish twat.