One cannot forget that show business also deals with humans. Everything is not so superficial that this is rigged or planned. Sometimes people do fall in love with each other because they spend a lot of time on the sets so much so the set becomes your first home, and your actual home becomes your second home.
Being an actor in TV or movies is different. A film or TV actor, if put in theatre, won't know certain dimensions, while a theatre actor won't know certain things when he comes before the camera. So I think a film actor can learn emoting from this theatre counterpart, while the theatre actor can learn about camera techniques from the film actor.
Whenever I don't have anything to do, I play Candy Crush or Scrabble. We actors have time between shots, which we need to kill. And we cannot call friends or family, as you are called at a moment's notice. So you need to do something which you can dispose of immediately when called for a shot.