Relationship satisfaction can be improved with small cognitive shifts called "love hacks." These involve changing one's internal narrative rather than external realities, such as adopting a "growth mindset" about compatibility or reinterpreting a partner's negative behavior more charitably (e.g., as situational rather than characterological).

The "opposites attract" adage is misleading for long-term partnership. While different hobbies can create short-term sparks, sustained relationships thrive on shared fundamental principles. Alignment on core beliefs, not surface-level tastes, is the key predictor of marital success.

Labeling someone with a fixed personality trait is misleading, as behavior is highly context-dependent and traits evolve over a lifetime. Choosing a partner based on current personality is less effective than assessing present compatibility and willingness to grow.

Counterintuitively, relationships thrive when partners feel seen for who they truly are, including their struggles. Acknowledging a partner's self-doubt is more bonding than showering them with praise because it confirms they are loved for their authentic self, not an idealized version.

Many people are objectively loved by partners or family, yet they don't internalize it, leading to a "love deficit." This discrepancy between the reality of being loved and the personal feeling of it is a primary source of misunderstanding and resentment in relationships.

From an evolutionary perspective, relationship stability hinges on key signals. Women need to feel adored, confirming their partner's protective commitment. Men need to feel admired, validating their role as a capable provider. When these core needs are unmet, the relationship's foundation erodes.

Citing author Gary Chapman, Polish shares a diagnostic tool for understanding people: what a person complains about often directly reveals their unmet needs and what they value most, pointing to their primary 'love language.'

The success of a long-term relationship is better predicted by how partners handle conflict and disagreement than by how much they enjoy good times together. People are more likely to break up due to poor conflict resolution than a lack of peak experiences.

Modern dating culture wrongly treats compatibility as an entry fee for a relationship. A healthier approach is to view it as the outcome of sustained effort and love. Compatibility is something you build with a partner, not something you find ready-made.