It's challenging to fully understand someone's motives without direct communication, but there could be several reasons why your ex acted this way when you bumped into each other:
Guilt or Regret: Your ex might feel guilty about how they ended the relationship or regret their decision to break up with you over text. Seeing you might have triggered those feelings, leading them to avoid facing the situation.
Avoidance: Running away could be their way of avoiding an awkward or uncomfortable encounter. They might not be ready or willing to have a face-to-face conversation or deal with the emotions that seeing you evoked.
Emotional Impact: Seeing you unexpectedly might have brought back memories and emotions that they weren't prepared to handle at that moment.
Fear of Confrontation: Some people are conflict-averse and might fear any confrontation or emotional conversation, especially after ending a relationship.
Moving On: Your ex might be trying to move on from the relationship and thought it would be best to avoid any interactions that could potentially reopen old wounds.
Insecurity: They might feel insecure or unsure about how you would react to seeing them, so they chose to remove themselves from the situation.
Shame: If they acted poorly during the breakup, they might feel ashamed and prefer to avoid any reminders of their behavior.
It's important to remember that people react differently to breakups, and their behavior might not necessarily reflect how they truly feel about you. It's also worth noting that emotions can be complicated and can lead to unexpected responses.
If you feel comfortable and think it's appropriate, you could try reaching out to your ex to have an open and honest conversation about the encounter and how it made you feel. However, if the relationship was toxic or harmful, it might be best to focus on your own healing and moving forward without engaging in further contact. Remember to prioritize your emotional well-being and surround yourself with supportive friends and family during this time.