Chad Wheeler's girlfriend told police ... the NFL player had stopped taking his medication for Bipolar disorder in the days before he brutally attacked her -- and had "snapped into a bad place" on the night of the incident.
It's all spelled out in the police report obtained by TMZ Sports in which the alleged victim attempted to explain why she believes the Seattle Seahawks offensive lineman violently attacked her.
The Kent Police Dept. in Washington say they first received a call from a friend of the victim around 9:45 PM on Jan.