I also agree it's a race to the bottom, lots of unpopular couples.
I can't imagine Shauna and the bieber, she seems so much older than him in terms of maturity, can't ever see that happening, and let's be honest, none of the girls are gravitating to him, not even Demi, boys got no game, he's not really trying with any of them, just spends his time being one of the lads. He only tries with whom he coupled up with but even that's not great. Not sure he knows how to flirt really.
I'd quite like Natalia to go, I don't like the behaviour, and think she adds nothing, and I'm not sure bieber is adding much either other than looking cute.
Rebecca at least, like her or loathe her, has something about her. The bloke she's with, not so much.