Why did the directors of 90210 write Dustin Milligan out of the show I know that I was a few years ago but I stopped watching it after I found out he left.?

Dustin Milligan's character, Ethan, was written out of "90210" primarily due to creative decisions made by the show's writers. They aimed to focus on other storylines and characters, leading to a shift in the ensemble cast. The decision was part of a broader strategy to refresh the series and maintain viewer interest, which sometimes necessitated the departure of certain characters.