Zach Jafarzedeh claims Bobbi - who is fighting for her life in hospital after being found face down in her bathtub on 31 January - used to take the anti-anxiety drug, which helps prevent panic attacks, on a regular basis and believes she may have done so following a disagreement with Nick Gordon.
The 21 year old - who stayed close to the 21-year-old aspiring actress, claims Bobbi has been taking Xanax since she was 16, after dating her in their teens, he said: "I know they got into a fight a few days before and she was really depressed about that and probably took a few Xanax and bathed and fell asleep.