When you lead, friendship should not be the number 1 priority ; as inevitably there will be extended tolerance for non performance and that will be detrimental for him/her, yourself and the company too.
Continue to demand the best from your subordinates. Be strict, be demanding and if friendship can grow, that is great.
As a leader, your primary task is to focus on performance and to grow others : & not being a “nice buddy” to everyone
Passions of Willie 
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