Di Maria, who is presently plying his trade for French Ligue 1 giants Paris Saint Germain (PSG), joined United in 2014 from Real for 59.7 million pounds. But he was unable to adjust to the English Premier League (EPL) and represented United for only one season.
My intention was always to stay at Real Madrid, Di Maria was quoted as saying by goal.com on Thursday.
I did not have much relationship with (club president) Florentino Perez.
The 27-year-old said that PSG has a great chance to win the Champions League this year and added that he still respects Real Madrid.
Di Maria also said he would not celebrate if he scores when PSG meet Real on November 3 in a Champions League group game.