Being a leader doesn't mean doing it alone. Whether it's for professional, or personal matters, every business leader needs people they can talk to, who understands their business, and understand their including how their career affects their life - from day-to-day challenges to the inner workings of their personal relationships.  In short, they have someone to bounce ideas off of, someone who can piece apart problems with them, see through given conclusions to new possibilities, and help them restart engines (metaphorical engines, like work patterns and ideas) when stuck.  This key person within their inner circle is sometimes a friend or a confidant or a colleague - and, oftentimes, it's a personal strategist.   

Leadership should never be lonely.  Not just because it's less fun that way, but because it's a sure fire way to waste valuable time and energy trying to navigate the decisions and challenges of leadership.