Priya is not asking Aditya to change but to take her feelings and emotions into consideration. She still wants him, she knows they need to talk but dont know where to start.
And i dont think she is acting immature. She is scared if she takes Aditya back and in the future if something were to happen and he goes against her again then this time she will not be able to pull herself together, she will completely break.
That is the problem. Priya wants time and Adi wants Priya. Priya has to take life on day to day basis rather than long term. Normal husband and wife will have so many differences and preferences. A question of adjustment from the wiser one will do the trick. Adi will remain Adi and time will not bring any dramatic changes in him. Priya has a choice. To move out of his life completely and start life afresh. Adi need not become Devdas. He can also move on.