How to treat lovers who don't hug, hold hands or kiss goodbye when they arrive at the station?

Couples don't hug, hold hands or kiss goodbye when they leave the station. I think they may have gone through a period of love and reached a dull period, so when they left the station, they didn't hold hands, hug or kiss goodbye. They are used to this feeling, so I think it's quite normal. The affection between them is fluid, not so warm, but also very affectionate.