"To the beginning of our forever," the couple said on a shared Instagram account.
The couple publicly announced they were an item at the 2019 Australian Open when Monfils appeared in Svitolina's player's box. They soon began documenting their relationship across social media, becoming one of the most beloved couples in tennis.
They previously announced a separation in February.
However, they soon rekindled their romance and have decided to make an even longer-term commitment to one another.