Last Day by Claire Dyer

9780995751064 Dome Press
Every ending starts with a beginning; every beginning, an end. Boyd and Vita have been separated for six years when Boyd asks if he can move back into the house they still own, bringing with him his twenty-seven-year-old girlfriend, Honey. Of course Vita agrees: enough water has travelled under enough bridges since her marriage to Boyd ended and she is totally over him; nothing can touch her now.

Boyd and Honey move in and everyone is happy, or so it seems. However, all three are keeping secrets.