Andre Villas Boas worked under Mourinho for seven-years at Porto, Chelsea, and Inter Milan, and faces him for the first time when Chelsea and Spurs meet at White Hart Lane, this Saturday.
"I don't lose any sleep," he said.
"We had a great personal and professional relationship before. We don't have that now."
Reacting to numerous requests to comment; he answered: "I've got nothing to say."
AVB split from Mourinho, having worked as a scout for him after the Special One rejected his plea to move to a more senior role.
Villas-Boas went on to become a successful manager, winning the League title and Europa League in 2011, with Portuguese side, Porto. As Mourinho previously had, AVB was appointed Chelsea manager, and managed them between 2011, and 2012 before making the move to north London.
"Our break-up point was because I was full of ambition to give him something extra and I wanted further involvement from the job I was doing at that time," said Villas-Boas.
"I felt I could give him much more. But he didn't feel the need for somebody near to him or in another position as an assistant, and because of that it was decided that it was time, after Inter Milan, to continue our careers apart."
When asked if it would be fair to say that Villas-Boas no longer considers himself friends with Mourinho, he replied: "Yes, I think so. I don't think we need explanations. But our relationship has broken down.
"I think we have the mutual respect for each other and we understand what we have been through cannot just disappear, but it's not like it was before."
On the topic of his attempts to sign Juan Mata, whom he managed at Chelsea, he said: "When top players become available, when their situation changes at a club, and particularly for a player like Juan Mata, you enquire about the situation, but nothing went further than a simple enquiry," added the Spurs boss.
Tottenham welcome Chelsea to White Hart Lane knowing that they stand a very good chance of taking something the game. Villas-Boas' side sit joint top of the table with arch-rivals Arsenal after a very good start to the season whereas Chelsea remain 4th, two points behind.
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