Thurman, who has been a friend and muse to Tarantino for many years, starred in director's films like 'Pulp Fiction' and 'Kill Bill'.
Thurman and Tarantino came close during the Cannes Film Festival where they celebrated the 20th anniversary of 'Pulp Fiction', reported Us magazine quoting multiple sources.
"They had a thing and got together again recently. He's loved her for years," a source told the magazine.
'Pulp Fiction' was Thurman's breakout movie and later went on to work with him in 'Kill Bill: Volumes 1 and 2.'
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Thurman was married to Ethan Hawke for six years before divorcing in 2004.
In 2007, Thurman got engaged to hedge-fund magnate Arpad "Arki" Busson, with whom she shares 22-month-old daughter Rosalind Arusha Arkadina Altalune Florence Thurman-Busson.
Thurman and Busson ended their tumultuous on-and-off again relationship recently.
Tarantino has previously been linked to stars like Kathy Griffin and Mira Sorvino.