Bobby and Robyn had some physical altercations and I think there were times when he wasn't always the winner but then Whitney would come in between them and she would pour the oil in the trouble waters.'Whitney died in 2012 when she drowned after suffering a massive heart attack, brought on by years of cocaine abuse.
Her friends and family - and even Bobby Brown - believe that she might still be alive if she was allowed to be with Robyn.
Whitney's family and friends believe Robyn was pushed out by her mother Cissy Houston, who disapproved of their romance.
Whitney's relationship with Robyn caused even more tension between the singer and Bobby Brown, who was six years younger than the singer and is often the one blamed for her downfall.
It's amazing how effective that job that Clive Davis did was, he sold it and it worked.
She was the darling of white American teenage girls.'Both the filmmaker and those he interviewed agree that the group surrounding the singer, including Bobby, Robyn, the family and even Whitney herself, were violent.
Speaking exclusively to Mail Online, documentary maker Nick Broomfield credits Robyn for keeping Whitney 'on the rails' but believes her fans are too obsessed with the intimate details of their relationship.
The filmmaker, whose movie about the legend airs on the BBC this weekend, finds it bizarre that Whitney's fans are so interested in her sexuality and the nature of her relationship with Robyn.
Davis steered Houston's career for more than 25 years, also serving as a mentor.
Whitney Houston's closest friends believe she was in a lesbian relationship with her assistant.
In a documentary about her life, those closest to Whitney say she was in a relationship with Robyn Crawford, 56, the woman who spent 20 years by her side working for her.
He told Mail Online: 'It's almost like people want the condom or here's the stained sheet.
I don't know what kind of conclusive proof one wants except this is the closest relationship for years that Whitney had.'They shared a house together; they often shared the same bed.
I think the most important thing is that it was the most productive, supportive and creative relationship that she had for probably 15 years.'In the movie Ellin states her belief that Whitney was bisexual, having feelings for both Robyn and her husband Bobby Brown.