relationshipwreck

noun. where two people are in a relationship that is 1. constantly breaking up and getting back together. 2. is miserable for one or both parties but is still "intact" 3. a constant emotional battle (i.e constant bickering and fighting resulting in above, 1.)

Friend 1: i cannot believe they are back together! they hated each other yesterday!
Friend 2: i know! they have a relationshipwreck
, for sure.