Conflict
Conflict (noun & verb) /ˈkɒn.flɪkt/ US /ˈkɑːn-/
noun: a serious disagreement, argument, or fight among people, groups, etc., rift, disagreement, struggle, fight, battle, encounter, clash – opposition, discord, quarrel, divergence, fracas, dispute
The spouse, who invariably were in conflict, finally got a divorce.
Antonyms: peace, concord