Notwithstanding the premise and medium of this "entertainment" encourages vain, self-promoting twats to play up to the audience.
The apparent scenario is:
Pretty, assertive, moody, fashionable girl dates uncharismatic child who is clearly dating above his weight.
He's apparently crap in bed relative to her sexual appetite, to whit he either ignored or did not care that he couldn't perform to her communicated sexual demands or she didn't assert her sexual needs.
He makes her laugh a lot without us knowing how sophisticated her sense of humour is or if she was in fact laughing at him all the time.
We don't know what they have in common apart from wanting to be on YouTube.
We don't know how much either of them tried to re-engage after break-up and how pitiful the entreaties were.
If I was fortunate enough to be hooking up with her looks then she wouldn't have been cheating on me because of the poor sex or the juvenile wardrobe.
You lot can probably list a ton of other reasons why we'd split up though.