The stuff with Cole is so deeply uncomfortable and this kind of thing is why ITV have had to go so far in introducing mental health support to LI contestants over here. You've got two completely incompatible people, both a bit toxic, paired together and they seem to be contractually obliged somehow to stay together until the wedding despite these glaring differences and we're all just riding out how that's impacting their mental health for the entertainment value of it all. The production team is what's at fault here - shame on them for the complete lack of duty of care to the cast and Cole in this instance.
I watched that scene with the oranges and you could not find someone more shut down and completely disconnected to someone than Zanab was in that moment. Her body language is literally screaming that she hates Cole, isn't listening to him, has no interest in him, is in completely contempt for him as he's excitedly talking about plans to meet her family. It's so obvious she has NO plans for him to ever meet her family and is giving him no generosity or benefit of the doubt at all in what he's saying. She interprets everything as an attack, while he's just trying desperately to connect with her. The "are you having another orange" is completely innocuous, she immediately interprets it as an attack and the whole reason why she seems to have some food restriction issues and that goes way over Cole's head. If she decided to starve herself because she was so insecure with Cole - with respect, that's her own mental health issue and Cole didn't cause that. She could just as easily have confronted him about that in the moment, and told him not to comment on her food, her body, she could've walked away because it was so triggering. But she didn't, she starved herself and expected him to mind-read about it.
I actually feel sorry for him despite all his foibles - at least he tried, at least he apologised, at least he gave the relationship a chance. She just shut down long before she walked down the aisle and no doubt has given the guy a whole rake of complexes and trust issues for how she didn't communicate with him and then launched an attack when he was his most vulnerable, in front of a televised audience. She's toxic and needs a lot of therapy, hopefully before she starts dating again.