Head of the CIA resigned this week when the FBI found out he was having an affair. In certain jobs caesar has to be beyond suspicion. Our mayor for instance is living with the head of planning for the council. There came a point where they had to go public. And once she has finished being mayor and reverts to being a normal councillor, she will have to be very careful about the decisions she is involved in. That sort of thing is one of the downsides of public life and most people understand that there are boundaries that must be maintained.
So what is the right thing to do, when you become leader of a political party, let alone PM? Review your social life and ask yourself where are the potential pitfalls, conflicts of interest, places where you might be accused of being too matey. And say to those friends: - While i am in that job we will have to maintain a professional distance. Hope one day that we will be able to be close friends again.
The alternative plan is to review your list of "best friends who I went to school with" and give them jobs. 