Love the one you're with

​What happens when friends become family and your family ain't even your friends?  I call that church.  Say what?  
  I'm so confused.... That's okay, so am I.  That's a vicious circle and a tale for another day.  "Love the One You're With" is a song by folk rocker Stephen Stills and I'm with him.
  Jesus also says to John 15:9 Love the one you're with.
Okay, so this is my interpretation but....why can't we love the one we are with?  Jesus did.