Sonia, returning to school in your dream is a powerful symbol of revisiting past experiences and the feelings associated with them. This dream could indicate a deep, subconscious desire to address unresolved issues or to reclaim a sense of youth and learning. Schools in dreams often represent a place of learning, growth, and sometimes, stress or anxiety. Since you're currently in a stable relationship and at a mature stage in life, this return to school might signify an inner assessment of what you've learned in your personal journey and how it has shaped you.
The act of going back to school can also be a metaphor for a situation in your current life where you feel like you need to 'relearn' or 're-educate' yourself. Perhaps there is a new role or responsibility that you’ve taken on, and your dream is reflecting the process of adapting to this change. It could also suggest a need for self-improvement or a feeling that you might have missed out on something important in your earlier years, which now, in your more reflective stage of life, you wish to revisit or understand better.
Being in a school setting can sometimes evoke feelings of competition, comparison, and striving for approval, which might be relevant to your current life circumstances. There could be pressures or expectations in your professional or personal life where you feel the need to prove your worth or abilities, much like a student aiming for good grades.