"It is heartbreaking for me to have to say today that I and Mr Haasan are no longer together. After almost 13 years together, it has been one of the most devastating decisions that I have ever had to make in my life," she wrote in a blog whose link she later posted on her Twitter page.
A cancer survivor, the actress said, "It is never easy for anyone in a committed relationship to realise that their paths have irreversibly diverged and that the only choices in front of them are to either compromise with their dreams for life or to accept the truth of their solitude and move ahead.
"It has taken me a very long time, a couple of years at the very least, to accept this heartbreaking truth and come to this decision."
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"Not all of these changes might be what we expect or anticipate but that does not, in any way, negate the very real impact of these diverging priorities in a relationship," she said.
"This decision to set forth on my own at this stage in my life is perhaps one of the most difficult decisions any woman will ever have to make but it is a necessary one for me. For I am a mother first and foremost and I have a responsibility to my child to be the best mother that I can be. And to do that, it is essential that I am at peace within myself."
Gautami said it was "no secret" that she was a fan of
Haasan, currently working on the trilingual 'Sabash Naidu', even before she entered the industry, saying she continues to "admire and cheer on his monumental talent and achievements."
She said she has stood by Haasan, 61, through all his challenges and they had been precious moments for her.
Gautami said she had learnt a great deal from working with Haasan as costume designer on his films.
Explaining the reason behind sharing "this monumental happening in my life," she said "I have always lived my life in your midst, with dignity and grace to the best of my ability at all times, and all of you have been a part of my life's journey in so many ways."
"I have received so much of love and support from you through the past 29 years and I would like to thank you for the many ways in which you kept me going through the darkest and most painful times in my life," she said.