They’ve been together more than 30 years, so why have Oprah Winfrey and Stedman Graham never officially married?

According to Winfrey, their choice to not marry is what kept them together.

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"The only time I brought it up was when I said to Stedman, 'What would have happened if we had actually gotten married?' And the answer is: 'We wouldn't be together.' We would not have stayed together, because marriage requires a different way of being in this world," she said in Vogue's September issue. "His interpretation of what it means to be a husband and what it would mean for me to be a wife would have been pretty traditional, and I would not have been able to fit into that."

Related: Oprah opens up about why she never had kids

The two talked marriage in the past -- Graham even proposed in the 1990s -- but ultimately decided that not getting married was right for them.

In 2016, rumors emerged that Winfrey and Graham were planning a wedding, but Winfrey tweeted that it was "NOT TRUE" after getting calls from six people who knew her who gave congrats or expressed surprise that they didn't get a wedding invite.