Whitney Houston is best remembered for her beautiful music, but to her best friend and apparently secret lesbian lover, she was more than just her music. 

In an exclusive tell-all interview with NBC news' Craig Melvin, Robyn Crawford opened up about her decade-long friendship with Whitney. In the release of her memoir entitled "A Song For You," she talked about their relationship and the level of intimacy they have reached. 

"I was a witness to her rise to fame, and I felt compelled to share who the real woman is behind her success," Crawford said during the interview aired on TODAY.

Curious, Melvin asked her why she made all these revelations seven years after Houston's tragic death in an overdose. Why is she choosing to tell her side of the story now? 

Crawford said she did not have any plans about publicly revealing her life and relationship, but then she wondered what would Whitney want.

"Would she understand that the right time is now?" Crawford continued. 

Speaking candidly, Crawford admitted that she and Houston were intimate at various levels. She continued saying that the two of them were deeply connected to each other, noting that their friendship has "reached a deeper stage" even though it started only as a physical attraction."

When asked about who else knew about their affair, Crawford simply said that she thinks nobody knew about it.

In 2017, however, Crawford's father gave an exclusive interview to RadarOnline and confessed that he knew about Houston and her daughter's relationship. According to him, the two have been together for 40 years. 

As Robyn revealed in her book, their physical relationship ended when Houston was starting to gain attention in the music industry. She said that Houston was the one who asked for them to stop being physical -- Whitney did not want anything to interfere with her budding career. 

In her memoir, Crawford narrated how she met Houston when they were still teenagers, becoming instant friends since then. She recalled Houston giving her a Bible to end the physical relationship they had.

Despite putting an end to whatever physical contact they had, the two of them remained good friends for years. However, things took a different turn when Houston married Bobby Brown. That was the beginning of her substance abuse. Her life continued to crumble and Crawford felt that it was the sign she was waiting for.

The two were estranged until her death in 2012. 

"I felt my insides were shattering," Crawford recalled when she learned about her death

The full interview will air on Dateline on Saturday, November 9.

READ MORE: Bobbi Kristina Brown Update: Whitney Houston's Death Still A Mystery 4 Years Later [VIDEO]