Pele, 75, told O Estado de Sao Paulo newspaper that this time, he has found "love forever."
Pele and Aoki met in New York in the 1980s but only started seeing each other in 2010, when they crossed paths in an elevator in Sao Paulo.
Aoki, a 42-year-old businesswoman, has been by the three-time world champion's side for nearly all his public appearances since 2012, as well as during his repeated hospital visits in recent years.
He scored 1,281 goals in 1,363 matches, appeared 91 times for Brazil between 1957 and 1971 and played his club football for Brazil's FC Santos as well as the New York Cosmos.