Dreams about encountering an ex can often symbolize unresolved feelings or thoughts related to that relationship. In your dream, the setting of stairs may represent a transition or progression in your life, as stairs often symbolize upward or downward movement. Skipping stairs could indicate a desire to avoid confronting certain emotions or situations, perhaps relating to your past relationship.

The fact that your ex and her friends didn't notice you might suggest feelings of invisibility or a desire to remain unnoticed in certain aspects of your life. It could reflect a need to distance yourself from past experiences while trying to focus on your current friendships and connections.

Consider reflecting on your feelings towards your ex and whether there are any unresolved issues or emotions that need addressing. This dream may be prompting you to think about how past relationships influence your present and future interactions.