Dreams like yours can often reflect feelings of anxiety, confusion, or a sense of being unprepared for certain situations in your waking life. Here's a breakdown of some elements in your dream:

1. Girlfriend and Travel: Your girlfriend's visit may represent a desire for connection or intimacy. The travel aspect suggests a journey, possibly symbolizing a transition or change in your relationship or personal life.
2. Flat Tire: This could symbolize obstacles or setbacks. It may indicate feelings of being stuck or unable to progress in a certain area of your life. The 'weird nuts' might represent complexities or unexpected challenges that you feel ill-equipped to handle.
3. Wrong Plane: Getting on the wrong plane may point to feelings of uncertainty about the direction your life is taking. It can symbolize fear of making wrong choices or not being in control of your path.
4. Subway and Pyramids: The subway often symbolizes a communal journey or following the crowd, while the pyramids can represent ancient wisdom or a long-term goal. Getting off at the pyramids might indicate a desire to reach a significant milestone, but feeling out of place or unprepared for it.
5. Blame and Clothing: Your girlfriend blaming you and only having warm clothes could represent feelings of guilt or responsibility in the relationship. It may also reflect concerns about not meeting expectations or being ill-prepared for challenges ahead.

Overall, this dream could be urging you to reflect on your current relationships and any feelings of inadequacy or anxiety you might be experiencing. It might be helpful to communicate openly with those close to you about your feelings and concerns. Consider what areas of your life might need more preparation or planning, and how you can address any obstacles you perceive.