There could be several reasons why old classmates ignore or avoid you when they see you around:
Time and Distance: If you haven't seen each other in a long time or have grown apart due to distance or different life paths, they might feel awkward or unsure about how to reconnect.
Social Anxiety: Some people experience social anxiety, making it challenging for them to approach others, even if they were once close classmates.
Regret or Guilt: It's possible that they have regrets about how they treated you in the past or feel guilty about something they did or didn't do, leading them to avoid you.
Unresolved Conflicts: If there were past conflicts or disagreements between you and your old classmates, they may avoid you to prevent uncomfortable confrontations.
Low Self-Esteem: Some individuals might feel inadequate or insecure about themselves, which can lead them to avoid interactions with people from their past.
Changes in Personalities: People change over time, and they may have developed different interests, values, or priorities, which could contribute to the disconnect.
Assumptions or Misunderstandings: They might assume that you're not interested in reconnecting or fear being rejected, leading them to avoid initiating contact.
Social Circles: They may be more invested in their current social circles or have formed new friendships that take priority in their lives.
Busyness: Sometimes, people might be preoccupied with their own lives, work, or family commitments, leaving little time for reconnecting with old classmates.
Shyness: Some individuals are naturally shy and find it challenging to initiate conversations, especially after a long time apart.
It's important to remember that these reasons are specific to each individual, and it's not necessarily a reflection of how they feel about you personally. Social dynamics can be complex, and people's behaviors are influenced by various factors.
If you wish to reconnect with old classmates who seem to be avoiding you, consider taking the initiative and approaching them in a friendly and open manner. If they remain distant, respect their boundaries and focus on nurturing existing relationships or forming new connections with people who value your friendship. Sometimes, it's better to focus on the present and future rather than dwelling on past interactions.