What does it mean to love someone for life if you don't go to town in this misty rain?

The whole poem is "From then on, misty rain falls on the capital, and one person holds an umbrella and two people walk together", which means that from then on, misty rain falls on the capital, and one person holds an umbrella and two people walk together. The whole poem is: from then on, misty rain fell on the capital, and one person walked with an umbrella. If you don't go to town in this life, how can you love someone all your life? From then on, I stopped going to Beijing and traveled around the world with an umbrella. From then on, people who no longer love her, a glass of turbid wine and red dust. Misty rain doesn't have to enter Jincheng, just one person holding an umbrella. Walking alone in Wan Li, there is no one.