He takes it upon himself to save the dwarves, multiple times (from the spiders and the elves most notably.)
That tends to be the husband's role and many men would feel emasculated if you did this. Of course, even if women have traditionally been the home makers and men have been the wage earners, women...
He was their official Burglar.
Lack of self esteem.
guidance,direction,counselling,coaching and inspiration of others and Informal leadership