Better by Far by Hazel Hayes

A genre-bending story about love and loss, hope and heartbreak, and the healing to be found in life’s little limbos, those in-between spaces where you’re no longer who you were and not yet the person you will be
 
Following a breakup, Kate and Finn decide to keep sharing their house until the lease runs out in twelve weeks, alternating week by week so that they are occupying the same space but never at the same time. Practically, the plan makes sense, but coming back each Sunday to a home where Finn has been feels far too much like living with a ghost. Soon Kate finds herself adrift in her own subconscious, trapped in the liminal space between loving someone and letting go.