If You’re In an On-Again, Off-Again Relationship, This Article Is For You by Isabella Gomez Last week, rumors flew when Miley Cyrus wiped out all her Instagram posts-including the ones of her boo Liam Hemsworth. Entertainment sites rushed to cover whether or not the pair had split up, and although Liam quickly confirmed that they’re very much together in a cute Instagram video, the whole fiasco sparked our curiosity about on-and-off relationships. It’s easy for us to become heavily invested…