At the end of Season 4, after working for nearly 13 years together, Donna quits being Harvey's assistant and is now working for Louis. She decided this because her relationship with Harvey is not working for her. Louis also said to her in a conversation that Harvey is unaware how lucky he is to have Donna.

Does Donna ever go back to Harvey?

Donna returned to Harvey after leaving him to work for Louis at the beginning of the season because only she could help him with Mike's case.

What happened with Harvey and Donna?

Their wedding was not the only shock for fans in the finale as Harvey revealed at the end that he and Donna were leaving New York City for Seattle. The pair decided to head off to join the firm that Mike Ross (Patrick J Adams) and Rachel Zane (Meghan Markle) work at. Suits season 9 is available to stream on Netflix.