I think if someone could figure out a formula to restore trust in a relationship/situation they would be worthy on a Nobel Peace Prize.
Personally, I do not believe there is anything the other person can do or say to regain a lost trust. You spend most of your days consumed with his words or lack of them, reading between the lines, adjusting your sails to meet his ever changing needs. I have lived with false hope, "the maybe this time he gets it" and quite frankly, it's flipping exhausting. There either is trust or not. period.
No wonder we get so confused, we are tired, tired of overthinking the same situation over, and over , and over. Looking for a non existent silver lining. Soothing ourselves with the " it could be worse". But this is what happens every stinkin time when we give our power to another. We are left to doubt ourselves and our self worth.
Peace.