Commitment is defined as an individuals subjectively perceived dependence on a relationship and significantly predicts relationship stability. It is correlated with attachment anxiety, a dimension of attachment insecurity. Previous research shows that the variables of the investment model (IMV), i.e. satisfaction with, alternatives to, and investments in a relationship mediate this correlation. It is largely unclear, however, whether cognitive or behavioral aspects of those variables or partner perceptions of these aspects have a greater impact on relationship commitment. Therefore, the participants of the current study rated their own cognitions and behaviors concerning the IMV, as well as according partner perceptions. Additionally, the effect of identification with the current relationship on the correlations mentioned above was explored. Data of 409 participants (326 female/83 male) was collected using a self-administered online questionnaire. For each IMV a multiple, parallel mediation-analysis was computed. In the satisfaction model relationship satisfaction significantly mediated the correlation between anxiety and commitment. In the alternatives model behaviors expressing alternatives mediated this correlation. In the investments model perceived partner behavior indicating investments acted as a significant mediator. Relationship-specific identification functioned as a considerable mediator in those correlations and no direct effect between anxiety and commitment remained. The results demonstrate that a differentiated analysis of IMV in the relationship between anxiety and commitment is important.