Why did Gaoshun think Jinshi would quickly get over his obsession with Maomao?

Just started reading the LN, but I don’t mind spoilers!

One thing that I’ve been thinking about recently is why Gaoshun thought Jinshi would quickly get over his obsession with Maomao. Jinshi has never been interested in another woman before. Wouldn’t the first girl that Jinshi becomes infatuated with (the one girl that was able to capture his emotional and sexual attention despite taking the eunuch medicine) be someone that would keep his attention for longer than a toy?