Really? I thought that was his M.O. as a narcissistic, psychotic killer. Even when, in court, he said that he can bench press 50kg but doesn't think that is particularly impressive, posters on here were tearing their hair out in frustration at the way this boy likes to show off in 'look at me i can lift weights' way. Don't forget also that he couldn't contain himself from sending snapchat videoes of him claiming to be the killer (this was definitely not banter, he definitely likes to brag about his achievements - Sick, Sick, Sick)
So, based on that i guess he would confide in people and/or brag to them. Respectfully.