The 28-year-old said he still suffered nightmares after thugs threatened to shoot him during a raid on holiday.
Dexter confessed everything to his housemates as he tried to explain his “strange and guarded” behaviour in the house.
He admitted that the incident, which happened in Portugal, left him “freaked out” and crippled by anxiety attacks.
Reliving the attack he explained: “Some guy got in the car. He had a gun and put it against my head.
“Because I was wearing a suit, they thought I was the one with the money.
“There’s nothing like having a gun in your face though to give you nightmares.
“I was freaked out, my mates saved me.”
As the rest of the house listened in shock, Dexter went on to admit it had a huge impact on him.
He added: “I was having anxiety attacks a few months ago when all that stuff came out. I remember being at an interview and I couldn’t speak, I was getting agoraphobia.