What is Gatsby’s view of the past? When Nick says that Gatsby “wanted to recover something, some idea of himself perhaps, that had gone into loving Daisy,” what do you think he means?

Gatsby wanted to repeat the past or at least his illusion of it. Despite Daisy being married Gatsby wants to re-create a time when he fell in love with Daisy. It is an idealized version of the past that Gatsby craves. It's been 5 years since he last saw Daisy. Gatsby wants to ignore the years that he wasn't near Daisy and simply carry on with his fantasy.