What does Pu Shu mean by "those flowers"?

Those flowers are not all our former lovers. I think they are our past years and feelings. I don't know if I will feel this way after so many years. This kind of beauty, perhaps we no longer have this feeling. Those flowers are the past youth and years, those things that have passed away and never come back, and those memories of youth may be lovers, but they may not be lovers, because good years have nothing to do with love. Those flowers, our flowery past, are now full of flowers.