Yes, UX psychology can help you understand why users make certain decisions. By applying psychological principles such as cognitive biases, heuristics, and motivation theories, you can gain insights into the underlying mechanisms that drive user behavior. For example, understanding the confirmation bias can help you design interfaces that encourage users to explore different options, while understanding the Zeigarnik effect can help you design interfaces that encourage users to complete tasks. By applying UX psychology, you can create designs that are more intuitive, user-friendly, and effective.