When trying to force through a move, Courtois refused to turn up for training, which led to sections of Chelsea's fanbase losing trust in him.
And he made matters worse by suggesting the quality of players at Real is better than at Chelsea.
"It makes me feel sad and obviously they don't know all the truth," he told Sky Sports News. "I think in March the decision was already made and I thought the club would accept it.
“Then because the transfer was closed I did not show up because I thought it better not to disturb the team and the squad.
"If I did go there maybe, I didn't want to be toxic, so obviously it is a pity because I love Chelsea. I loved playing there and I am happy to have won two Premier Leagues, a League Cup and an FA Cup.
“Hopefully it will turn around.
"Obviously you get some things in the media like I said there was not enough quality at Chelsea.
“I never meant that.
“I will always look back with a happy feeling to Chelsea. I had a chance to go back to Spain to be closer to my kids.
“That was an important thing for me.
“I know that a lot of Chelsea fans will understand my decision.
“I wish them the best and I am happy to see that they have won their first four games and I hope they can go on and win the league."