Warning! Spoilers about Greys Anatomy season 20, episode 3 ahead.

Winston's behavior in Grey's Anatomy season 20, episode 3 shows he has reached the point of no return in his marriage with Maggie. Winston finally puts himself first by removing his wedding band, signaling the end of his unsuccessful marriage. The ending of Grey's Anatomy season 20, episode 3 closes the shared chapter between Maggie and Winston, giving them a chance to be happy by themselves instead of unhappy together.

Winston and Maggies relationship seemed doomed before the Greys Anatomy season 19 finale gave some hope about it surviving, but season 20, episode 3 showed the true damage it secretly sustained. Maggie and Winstons relationship differed from Maggies previous ones, possibly even lasting the longest because Winston brought out Maggies most easygoing side, countering her tendency to plan meticulously and act most reasonably with his spontaneity. Winstons move to Seattle in Greys Anatomy season 17 was proof of that,...

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Grey's Anatomy Season 20 Just Proved Maggie & Winston Won't Be Endgame - imdb