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Description: The attachment system regulates and motivates behavior to maintain security and cope with insecurities. Although such processes require dynamic coordination of different attachment states, research on the topic has been scarce. In this study, with a preregistered analytical plan and hypotheses, we used two ecological momentary assessment (EMA) samples (Ns = 122 and 127) to examine the cross-lagged effects between state attachment security, anxiety, and avoidance. We hypothesized dampening effects between state security and insecure states. Moreover, we hypothesized that trait attachment would moderate the state-level dynamics. Both samples included an initial questionnaire phase where trait attachment was measured using the Experiences in Close Relationships–Revised. In the following EMA phase, attachment states were assessed seven or ten times daily over a week using six items from the State Adult Attachment Measure. Dynamic structural equation models showed that state security predicted a decrease in both state avoidance and anxiety. Some evidence also emerged for state avoidance predicting decreased security. However, trait attachment did not show the expected moderation effects on the state-level dynamics. Our study underscores the predominance of security over insecurities in daily life, suggesting that the functioning of the attachment system centers on fluctuations in the sense of security.