Our adoption placement fell through, how do we remain hopeful and realistic?

My husband and I have been on the journey of becoming adoptive parents in an open adoption. Things moved very quickly (started process just three weeks before due date) after several visits with birth mom (meeting family, doctors appointments etc..) we felt that all communication told us that things were moving forward. We have always completely respected her choice to change her mind at any point before the adoption paperwork was signed…but were completely blind sided after three days at the hospital together (referring to us as the adoptive parents and introducing us as his mom and dad, sharing him between our two rooms) that she asked us to leave with out him. We are told that the situation is still ‘fluid’ but how to we remain hopeful and also realistic? Heart broken AND Hopeful.