Sure, there were sometimes trustworthy friends that would be willing to go to hell and back for the protagonist, but how common were they really?
For every protagonist that was fortunate enough to have that kind of a friend, there were at least 10 others that had been crippled by a lover or sometimes even a blood brother!
Dante refused to believe that those Heavenly Emperors that had been living for thousand years were all fools and only surrounded themselves with bad people. Yet, in the end, weren't they all cut down and betrayed by everyone they ever held close?
People change, this was the simple hard truth.
A person who could take a bullet for you one day could easily wake up and stab you in the back the next.
It was because of this fact that although he told Rebecca and co some things; they were still mostly left in the dark.