Sorry to say but yes, Simba did change, and changed to much for me! I wish he would have just let Kiara have her freedom! Thats all Kiara wanted! And Simba's like 'Oh no you have to stay on this path blah blah blah' The same thing happened with Ariel. She wouldn't let her daughter go in the ocean.
Back to topic, yes Simba did change, but I'm just glad he shaped up in the end!
