• Do they ask you questions about yourself, as if they’d like to get to know you better?
• Do they tell you things about themselves beyond surface small talk?
• Do they give you their full attention when you see them?
• Does the other person seem interested in exchanging contact information or making specific plans to get together?

If you can’t answer “yes” to most of these questions, the person may not be the best candidate at this time for friendship. They may not be open to a new friendship now, even if they genuinely like you. Maybe their social calendar is already overfilled or they’re too busy with other responsibilities. There are many possible reasons, so try not to take it personally!