Josie quit 'Ultimate Big Brother' yesterday (26.08.10) because her new housemates made her feel "paranoid".
The sales rep admitted she started questioning John James' feelings for her after remarks made by 'Big Brother 5' winner Nadia and racing pundit John made her question her romance and pine for her fellow 'Big Brother 11' contestants.
She explained in an interview on 'Big Brother's Little Brother': "Well you're trapped. I didn't know what was going on or being said and all the paranoia starts setting in then doesn't it.
"I felt claustrophobic. I was missing all my old housemates, I felt paranoid... I just had to get out of there."
Josie decided to leave the house on Wednesday (25.08.10) after growing increasingly claustrophobic in the compound, and admitted she found life in the house particularly tough because of her brief exit when she was crowned 'Big Brother 11' champion earlier in the week.
She said: "'I was laying in bed last night and I was looking at the walls and they were coming closer and closer to my face and at one point the wall was touching my nose... so at that point I realised that I was going a bit potty and I had to go.
"I think the problem was I'd left. I'd seen all my friends and family and I'd seen everyone I love the most and then I had to go back in and then when I went back in."
The 25-year-old Bristolian left the house by a fire exit and in a bizarre twist of fate, ran straight into her house boyfriend John James, who was there to record a message of support for her.
Speaking of their shock meeting, she said: "I thought he was one of security and I was like, 'Get off', then I realised it was John."