Sources tell TMZ that the woman who left the three-page text message on Brown's cell phone was his manager Tina Davis...
Davis -- who turns 40 this month -- was rumored to have had a relationship with Brown when he was 16. Brown and Davis have denied it. Law enforcement tells TMZ the text message to Brown talked about hooking up later -- and it totally pissed off Rihanna. She slapped and hit him and he then brutally fired back. The detective's affidavit refers to the text message as being "from a woman who Brown had a previous sexual relationship with."
