Dreams about leaving a partner can often reflect underlying feelings or concerns in your relationship. It may indicate a desire for freedom or independence, or it could suggest that you're contemplating the dynamics of your relationship. The fact that your partner didn't seem to care in the dream might suggest feelings of emotional distance or a lack of support in your waking life.
Consider reflecting on your current relationship and how you feel about it. Are there unresolved issues or feelings of neglect? This dream might be prompting you to address these concerns. It's also possible that your subconscious is exploring your own feelings about commitment and personal needs.
Take some time to think about what aspects of your relationship make you feel secure and valued, and what areas may need more attention or communication.