Although being bomb dropped is horrible, YOUR emotional trauma is not his to bear. It is not his job to make you happy.
This is a place where DB'ing comes into play. Our job is to make ourselves strong, healed and whole. Once we are at this place then having a relationship with another person that is strong, healed and whole can then happen.
So your job is to work on your 50% of the relationship - YOU.
You make yourself into a person that only a fool would leave.