Congratulation with a piece of loneliness!

The Golden Week holidays have started today, but during the period I will avoid driving and will go out on foot.
My son got married to a girl and decided to live away from his parents.
When I think about the past, I've lived together since I met when I was born more than 30 years ago.
Those who meet will definitely leave for some reason, but I didn't think it yesterday or today
Various acts changing! Nothing stays as it is, everything keeps changing continuously.
I hope their happiness from the bottom of my heart, but a piece of loneliness remains.
I have realized this feeling as the first time when I was in this position.