回複：thanks a lot! I tried to restore the relationship with hard w

1. "if not fit to each other, nothing I can do."
Correct.
But, if business is good, there are always chances to create opportunities.

2. once some conflicts happened, it is not repairable.
Not really.
Conflicts can be managable if both of you act sincerely and professionably, and you might take initiatives, put efforts, communicate well to mend the working relationship.