Nathan Sykes reportedly had a secret meet-up with Ariana Grande at her house in Los Angeles yesterday. The Wanted singer was photographed in the airport that same day with a huge smile on his face. So is Nariana officially back on? Did Nathan and Ariana ever actually break up? Unfortunately, we still don't have the answer to either of those questions.

Ariana and Nathan aren't the only celebrity couple whose relationship status is totally confusing. Click through to see more couples who have had on-again, off-again relationships, then let us know whose relationship you find the most confusing in the comments below.