Dean and Ziggy (After what seems like forever they seemed to finally ready to let Dean and Willow be a thing, out of nowhere comes these two. Which wouldn't bother me so much-even if I don't like Ziggy- if they would let them just be two people who are dating, but them trying to push them as the next supercouple is irritating.)
Aden and Belle
Casey and Tamara
Brax and Charlie
I'm sure there's more, but off the top of my head these are the big ones.
Kirsty and Kane (I can't look past what he did to Dani)
Matt and Maddy (I am still raging about them breaking up Osca