I think at the time they are saying it, they believe it to be true. Maybe it helps them justify their current actions/decisions if they believe that their history was awful. Because then it is something that can't be fixed. The good never existed, so how could it be fixed/return?
Just my thoughts...
TPS Me: 44 H: 42 M14 T17 S10 D7 10/10 H moves out after death of his father-same month 21/04/12 H is 'DONE' 04/05/12 OW/PA confirmed (rumors from 2010) July '14 H ends affair May '15 H moves back home