If you meet someone and exchange numbers, what does it mean?

Anonymous

Hi,

I'm not sure how to ''keep'' friends is the question. If you meet/befriend someone and have a nice time, but also happen to exchange numbers, what does it mean when they call you later on? especially if the friend is a guy.

Any advice for an introvert, in addition to this the understanding not to encourage someone if he seems open to consider you a potential romantic interest or otherwise, would it make sense not to answer back just because of the possible outcomes or could it be a friendly call with no expectations on the other side?

Also introverts, you ever have that anxiety over calls too or is it just me? thanks

If you meet someone and exchange numbers, what does it mean?
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