What are reasons some people don’t want to make friends (anymore)?

On my campus, I always see this beautiful girl who is often alone. Sometimes she talks to a few people but most of the time she sits somewhere with s book, her macbook listening to music. I thought she was excluded from others but when I talked to her she seemed nice but distant and told me that she isn’t looking for friends (or anything serious) and prefers staying alone.

What do you think of such people?
What are reasons some people don’t want to make friends (anymore)?
What are reasons some people don’t want to make friends (anymore)?
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