The chef pleaded with Nicole to divulge answers she had been asked by Big Brother in the Diary Room.
He wanted to know if she would be happy with the state of their relationship in the outside world but she refused, fearing punishment.
Not so blissful: Rex and Nicole argue over the Heaven and Hell divide
Rex angrily told her: 'I'm not going to be happy until you say it.
'It depends how much you value our relationship.'
The student insisted Rex was being 'selfish', adding: 'You should know how I feel. I've given you enough.'
After arguing for several minutes, Nicole declared: 'You should know me and trust me. Don't doubt anything.'
Angry: Nicole admits she is struggling to stop discussing things from the outside world
The 19-year-old student later retreated to the Diary Room again, where she told Big Brother she was feeling the pressure of being a couple in the house.
Speaking to Big Brother, she said: 'It's a challenge. It's a big deal coming on here.
'You're an individual but you've got to take someone else into account, and see everyone else. I need to get to know people and not just stay with Rex.'
And she wanted to make clear that she was her own person - and not just Rex's partner.
Struggle: Nicole told Big Brother she wants to be known as an individual
She added: 'We make our own decisions. We're different people, obviously. We will be individuals as time goes on, because I can talk to the other people and get to know them and not just rely on Rex.
'I want him to be there, but I am strong, and I am confident, and I don't have to be with someone.
'I'm my own person. I don't want to be known as Rex's girlfriend.'
After the couple stayed up talking till 4am this morning, Rex was hoping for a more positive reaction from Nicole today.
Rex said: 'Hey Nicole! You don't want to say good morning?'
A frosty Nicole responded: 'It's all right for you. I've had the worst day EVER in my life...
'I can't be bothered to explain.'
As Rex pressed Nicole for answers, she replied: 'I don't want to talk about it.'
A baffled Rex said: 'What have I done for you be like this? What's your problem? F****** weird.'
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