Kaka said he never considered himself a City player, despite Milan giving him permission to hold talks about a January transfer.
And the 26-year-old revealed he is "celebrating" his decision to pledge his future to Milan and says money would not influence his future.
"I feel great in a place where everybody loves me and I'm very happy to stay," he told Italian TV.
"My family were great allowing me to take the decision independently. I never argued with my father, as somebody wrote. I have listened to my heart as many people advised me to do.
"At Milan there are many wonderful people like (Berlusconi) and Leonardo, who is much more than a director for me, he is a real friend.
"I have never asked for a raise in my salary and I will never do so. Milan were always nice to me, raising my salary whenever they felt it was fair to do it. I can only thank them for this.
"After Saturday's game many people showed me their support, I have received drawings by kids trying to convince me to stay. It was wonderful. I remember when I left Sao Paolo some fans protested against me, here they all stand by my side instead.
"I'm currently celebrating this decision at home with a couple of friends. I'm a religious person and I believe the path God decides for us is not always the most logical one.
"Milan had never considered any offer for me in the past. This time it was different and I had to think about it but then I decided to stay. My team-mates were incredible. They all tried to tell me something and stay close to me in this period.
"I haven't been a Manchester City player, not even for one minute."
what a wonderful role model.... good on you senor kaka... the world is proud, you reperesent all that is still good in football..... and then we have tw/\ts like joey barton, rio "druggie" ferdinand, john "grab the ref's card" terry, thuggooney, "enslaved" donaldo, stevie "dj bashing" gerrard, moaner drogba, etc..... this lot ought to be ASHAMED..... a DISGRACE to the beautiful game is what the lot of them are.... obrigado friends!!!