The couple announced the decision in a statement to CNN on Tuesday.
“After much thought and careful consideration, we made the difficult decision to divorce after our separation last summer. We have the greatest respect for each other and remain close friends.”
The separation comes three years after they announced they were married in 2018.
Portner, a professor at the Broadway Dance Center, and the actor started dating in 2017.
The news comes two months after Page left as a transgender. At the time, Portner posted a support message on Instagram, “I’m very proud of @elliotpage. Trans, queer and non-binary people are a gift to this world. I also ask for patience and privacy, but that you join me in fervent support to trans life every day. Elliot’s existence is a gift in itself. Shine on sweet E. I love you so much. “