According to psychiatrist Mimi Winsberg, the degree to which two people mirror each other's texting style—such as vocabulary, sentence length, and emoji use—is a strong indicator of chemistry. This "language-style matching" is a digital equivalent of mirroring body language and predicts long-term sustainability.

According to psychiatrist Mimi Winsberg, text threads provide a real-time, objective record of a relationship's evolution. They can be reviewed retrospectively to diagnose when things went wrong—a relationship "autopsy"—revealing patterns of warmth or self-absorption that were missed in the moment.

Counterintuitively, arguing via text can benefit highly volatile couples. The act of writing forces a calmer mindset than speaking in anger. It also creates an objective record of what was said, preventing misremembering and disputes over words, and allowing for a more deliberate, less escalated conflict.

Studies on toddlers' reactions to parental separation identified four attachment styles. These styles, formed in early childhood, are highly predictive of an individual's attachment patterns in romantic relationships as an adult. However, these templates are not fixed and can be changed with self-awareness.

Modern communication (texting, social media) filters out crucial non-verbal information like tone, pacing, and emotional presence. This has led society to 'hypertrophy' word-based interaction while losing the high-resolution data that prevents misunderstanding and fosters genuine connection.

By feeding years of iMessage data to Claude Code, a user demonstrated that AI can extract deep relational insights. The model identified emotional openness, changes in conversational topics over time, and even subtle grammatical patterns, effectively creating a 'relational intelligence' profile from unstructured text.

The key to a successful long-term relationship isn't just chemistry; it's a partner's psychological stability. This is measured by how quickly they return to their emotional baseline after a setback. This resilience is more predictive of success than more fleeting traits.

While major life events can alter personality, most do so unpredictably. Across large populations, only two events have been found to reliably predict personality shifts: getting a first job and entering a first serious romantic relationship. Both tend to increase conscientiousness and agreeableness.

Trust isn't built on words. It's revealed through "honest signals"—non-verbal cues and, most importantly, the pattern of reciprocal interaction. Observing how people exchange help and information can predict trust and friendship with high accuracy, as it demonstrates a relationship of mutual give-and-take.