Westbrook is now back with her husband
Actress Danniella Westbrook left I'm A Celebrity... Get Me Out Of Here because she was worried it was affecting her recovery from drug addiction, she told viewers.
"I was living hour to hour in a world of hurt and thought, 'I've got to go to an AA meeting and centre myself'," she said in an interview on the top-rating ITV1 show broadcast on Tuesday night.
Westbrook, 29, a self-confessed former cocaine addict, left the celebrity reality TV show earlier on Tuesday after she gained too many viewer votes to be asked to leave.
"I need the support group I have got at home and if I don't have my recovery I do not have a life," she said.
She also decided to leave because she could not bear to be apart from her husband Kevin any longer.
"I'm relieved to be out, to see my husband and phone my kids. I was
hurting. I am a strong person. It wasn't about being in the
jungle, it was about how I feel inside."
She left the Australian camp just before 1100 local time on Tuesday after saying tearful farewells to fellow contestants on the endurance gameshow.
Programme makers Granada are now deciding whether to replace her with a standby contestant - possibly former Blue Peter presenter Tim Vincent or model Jodie Marsh.
Lloyd said she had missed her boyfriend
Bookmakers Ladbrokes are counting their losses after offering odds of 10/1 on her walking out - convinced she was faking her distress to get the sympathy vote.
They have had to pay out a four-figure sum to customers who correctly predicted that she would leave.
Westbrook, a former EastEnders actress, has been openly unhappy since the start of the show a week ago.
She had threatened to quit several times and packed her bags on Sunday night, although producers persuaded her to stay.
Westbrook had begged viewers to ensure she would be the first to leave by not voting for her as their favourite contestant.
But instead weather forecaster Sian Lloyd polled the least votes and was the first to be evicted.
Westbrook then burst into tears and lashed out at viewers for failing to vote her off.
She is now back with husband Kevin at a luxury hotel near
the camp in Queensland.
Earlier, evictee Sian Lloyd told hosts Ant and Dec she had been bored and had hated the experience of living in the Australian jungle.
The contestants have endured a week in the jungle
Lloyd said she had not been prepared for how much she would miss her boyfriend, Liberal Democrat MP Lembit Opik.
"I was so bored," she said. "Hours and hours with no telly, no books and no music. I really wasn't myself at all.
"The boredom was 10 times worse than what I expected and the lack of food - because we all suffered from lack of food."
The show's contestants are understood to be given up to a reported £25,000 each to cover out-of-pocket expenses and loss of earnings.
But a Granada spokeswoman refused to give details, saying: "We never discuss contracts, which are confidential and are between the artists and Granada."
The programme is in its second series following last year's ratings triumph in which almost 11 million people watched Tony Blackburn crowned king of the jungle.
It has been attracting strong ratings again this year, with Monday night's show peaking at 9.7 million viewers.