The Belgium international recently revealed he had put off contract talks at Stamford Bridge until the end the campaign in order to focus on his performances for the Blues.
However, with his ex-girlfriend and the mother of his children having left London to return to Madrid, Courtois admits being away from his family is taking a toll on his personal life.
"It [my private situation] is not always easy," he said. "But I'd also seen this coming. I knew that she [his former girlfriend] would return to Madrid, so that has its influence too.
"I love my children to death. When you miss them, you are sometimes wondering 'shouldn't I play in Spain in the next few years'? That's why I want to take my time to make a decision on that contract extension."