(I know it's Yuuki and Kaname but I've a reason)
(Idea from Pinterest)

The boyfriend is a vampire.
You get into a fight with him, you're quite annoyed over whatever it was so...
You wear all silver jewellery including a tongue and belly button piercing.
You eat food that have noticeable traces of garlic.
You go mirror shopping with him.
You wear a necklace shaped like a wooden stake.

You figure that seeing how long he's been alive he should remember as you wear your team Jacob top and force him to watch twilight