Train parking for only a minute

Life is very similar to a rapidly racing train. Forms, fields, stations flickered. You won’t have time to look around - you are already far behind ..., and you perfectly understand that the chances of a personal life are rapidly melting. And if there is a "decent person", ready to lead you to the registry office, you must agree.
Lisa has long been divorced. A marriage, concluded with great love, fell apart as soon as love passed. Everything in her life was calm and measured: an adult daughter, favorite work, meetings with friends, exhibitions and performances. But Denis appeared - the dream of any woman: faithful, honest, romantic exactly as much as decent in their age romance with Lisa. Everyone around persuades Lisa not to miss good luck, to jump into the last car.
But why is it so difficult for her to make a decision?