After 15 years of marriage, Bobby Brown is tossing his ex-wife, R&B diva Whitney Houston, under the bus in his upcoming autobiography, 'Bobby Brown: The Truth, the Whole Truth and Nothing But,' due in stores next month.

"I never used cocaine until after I met Whitney. Before then, I had experimented with other drugs, but marijuana was my drug of choice," Brown writes in the book. "At one point in my life, I used drugs uncontrollably. I was using everything I could get my hands on, from cocaine to heroin, weed and cooked cocaine."

Brown's claim that Houston -- who vehemently denied drug use and proclaimed that "crack is wack" in a 2002 interview with Diane Sawyer -- introduced him to cocaine is definitely not a shocking affirmation, but it's definitely an indication that there's no chance the pair will be reconciling any time in the near future.

Brown also claims that his union with Houston was "doomed from the very beginning." And the '90s singer takes it one step further and admits to cheating on his former wife on more than one occasion. "I am guilty of sleeping with other women," Brown admits. "Women are always throwing themselves at you. I'm only human, so I would make the mistake and bite the hook sometimes . . . I let the testosterone take over."

Houston's spokesperson reached out to PEOPLE to address the contentious claims in Brown's tell-all book. "Miss Houston is sad that Bobby feels he need to say such things but she choses to take the high road and will not speak badly about the father of her child even if it's to set the record straight," the Grammy-winning singer's rep said in a statement.

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