The phrase "kisses make up" generally implies that physical affection can help to heal any emotional wounds or conflicts. Antonyms for this phrase might include "grudges persist," "resentment lingers," or "animosity festers." These phrases indicate that instead of resolving conflicts, negative feelings continue to fester and grow. Other possible antonyms might include "no resolution," "lack of reconciliation," or "unresolved tension." These phrases suggest that there is no effort being made to repair the relationship or heal any damage, leading to ongoing disagreements and discord.