For better for worse is a statement said to couples to remind them to still love each other in trying times, when things aren't all that rosy and romantic; it might be health, finance,etc. The need to still be strong together, expressing love to each other in trying times.
It has never meant to suffer in marriage, it has never meant to become a slave, a punching bag, an atm machine in a marriage. Once trust, honesty, transparency and every or any human right has been violated, then it has gone beyond worse. It should be called off.