It is obvious De Bruyne is affected by the time he spent at Chelsea and he has revealed he only spoke with Mourinho twice.
De Bruyne is keen on making an impact on the EPL since joining City from Wolfsburg for a record fee of Â£55 million.
De Bruyne says he has matured since his time at Chelsea and pointed out a lack of communication with Mourinho was a problem.
“You can’t compare with me two years ago at Chelsea,” the 24-year-old said on Friday.
“It’s a different situation and I am a completely different person. I was younger and just didn’t play that much. I wasn’t even on the bench.
“I didn’t get any explanation. I only talked with him twice, Mourinho. That was before a game against Basel in November, where he said I was doing better and that I would get my chance.
“And then again one week before January, that’s the day I said I wanted to go out because, even if I was training better, I was not getting any minutes. So for me it was better to go.”
De Bruyne was sold to Wolfsburg and after an impressive season-and-a-half back in the Bundesliga – where he had previously played on loan from Chelsea at Werder Bremen – the versatile attacker earned a big-money move to City. He is thus relishing his second chance in the Premier League.
“You know there is going to be a lot of pressure,” he said.
“When I was coming here, the first thing I said to everyone was that when I get to England I will have to prove that I am a good player.
“I know everyone will talk about the money. It was the same in Belgium when I was with the national team for two weeks. They only talked about how much City paid to Wolfsburg, and how much I am going to earn.”