I wonder why Joseph feels solace in Glen's presence more than his friend? He met Glen like...

Maybe Glen has more charisma or a different, more comforting way of handling things compared to his friend. Plus, Joseph literally just had a fight with his friend. Sometimes people would rather confide in a stranger than someone who knows them better.

I completely agree with your last statement, because I'm the same.
I don't want to be judged by people I'm close to, so I confide in someone that I can't disappoint and hide my problems from those I see every day.