Full answer
Before trying to fix a relationship, both people need to agree that it's worth repairing. One person's effort alone cannot sustain a healthy relationship. A direct conversation about whether both parties want to work on things is the necessary first step.
Identify the root issues, not just the symptoms. Arguments about chores or money are rarely about chores or money — they usually reflect unmet needs around respect, security, or fairness. Naming the underlying need makes productive conversation possible.
Effective repair requires listening to understand, not to respond. Techniques like Gottman's "softened startup" (beginning with "I feel" rather than "you always") and reflective listening ("what I heard you say was...") reduce defensiveness and help both people feel heard.
Trust, once broken, rebuilds through small consistent actions over time — not grand gestures. Set specific, achievable agreements rather than vague promises, and check in weekly on progress rather than waiting for another blowup to surface the issues.