“There are many cases where A Rav will encourage someone to give a Get where there is no hope of reconciliation, although m’ikar hadin he isnt obligated too and he is hoping things will change.”
If the rabbi thinks there’s no hope but the husband disagrees and believes that there is hope for reconciliation, since we’re discussing a case where mikur hadin he’s within his halachic right to continue the marriage, if he exercises that right then he’s good. Ultimately in such a case Halacha gives him the call on continuing to hold out for shalom bayis.
“All I am saying is causing tzar to another person by forcing her to remain in a marriage that has no hope of reconciliation, is a wrong thing to do.”
Divorce may cause him a greater tzar than not divorcing causes her tzar. I would present it the other way — causing tzar to another person by forcing him to divorce is a wrong thing to do.