Military childhood, being moved around from pillar to post, then pretty much a university life after that.

Cant say I totally agree with his observation, because there was not one mention of the word trust. Sure it could be implied by virtue of discussing the topic of friends, but its just an observation and categorisation, which is simplistic at best.

Trust is something that happens over time, much like in a relationship, and with any sort of friendship, there needs to be trust. I can only assume from his military childhood and university movements, that his friendships perhaps dont have the depth of trust others seek or have. The problem with being too trusting and thus naive, is you become exploited whilst people masquarade as friends, and only once they have what they want from you, you see that friendship dissipate into nothing.