The dramatic episode was shown following a day of Twitter feuding between Lockie and glamour girl Sallie Axl.
Sallie claimed to be the girl Lockie cheated with.
Lockie fought back, tweeting: ‘I admit I've got myself in stupid situations socialising with girls like you!! But I have NEVER cheated on my girlfriend!!’
In the emotional episode, Dani turned up to Lockie’s house to end things with her TOWIE co-star.
‘I don't want to be with you, James,’ she said. ‘And you've f**ked it all up because of your behaviour.’
Dani later bravely turned up to TOWIE star Charlie Sim’s birthday party without Lockie.
She walked straight up to Gemma Collins and apologised for making comments about her weight in a heated argument about Lockie’s fidelity.
‘I feel so alone now because I've put this front on and I've been the stronger person in the relationship,’ she told her friends.
Lockie later told ITV: ‘Obviously I wanted to be with Danielle, she means everything to me but I can't understand where she's coming from. She's basically, like, shooting me down, she's giving me nowhere to go with it.’
‘Basically, she's walked out and that's it ... she's not giving me any leverage, if you like ... She ain't listening to anything I say. Obviously I thought me and her was worth more. She's basically thrown it all away over these tweets. I don't agree with it but it's up to her isn't it.’