Saying goodbye is always difficult, regardless of what the situation is. Even if you go on vacation and stay with a whole bunch of people who you have never lived with before, you will still undergo feelings of heartache and grief when the time to leave arrives. It's as if there is a mighty juggernaut force that is compelling you to feel sentimental and nostalgic!
When you stay and live in a particular place with a lot of people, you tend to form higher levels of attachment and an intimate bond with them. Even if they are strangers, you will tend to feel naturally attracted to them if you live with them for a brief period. As a matter of fact, I have witnessed many people become uncontrollably fond and even attached to others who are the complete opposite of the person they are. It's an innate feeling that is already psychologically inculcated into your mind and there is a lower chance that you will be able to escape this type of "feeling."
Whenever I'm departing from the airport or station, I always experience the idea of leaving something or even someone behind. That inner feeling tends to stay with me during my flight back home because all those captivating and adventurous memories keep on flashing in front of my eyes. Even if I close my eyes for a few minutes, those vivid and vibrant images are instantaneously making their way into my mind.
Meanwhile, it does take you some time to move on and carry on with your regular activities once you bid adieu to anything, in general. The moments before departure are also precious and reliving those moments is always a blessing. When a person resides in a specific place for an extended amount of time, forming lifelong memories becomes second nature and those memories convey an awe-inspiring story. In fact, you may transform into a raconteur to your kids one day when they insist on hearing a story from you!