The pair split in Marbella earlier this year but in recent episodes had been flirting and growing closer, leading Lockie to ask Danielle on a date and her to accept.
But speaking on last night's episode, Lockie told Dan Edgar he was worried about what could happen if they get back together and fall into old habits.
He explained: "I see her now and I see her happy. She's back to the girl I fell in love with. Full of beans and full of excitement and fun to be around. And when I see her like that, I want to be with her.
"Don't get me wrong, I'm still skeptical I'm moving too fast. Danielle, as soon as you do start going on dates with her, speaking from experience, her mind starts doing overtime and that's when she starts going, 'You've done this or that' and we start arguing again and it blows up and we're at each other's throats again and not talking."
He added: "Maybe too much has happened for us to be a couple again."
TOWIE airs on Wednesdays and Sundays at 10pm on ITVBe.
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