If a girl sits next to you and moves closer until your arms are touching, Is that a sign she likes you?

Anonymous
Essentially this girl was talking to me all weekend and then one day at lunch she asked for me to save her a seat next to me. Then while talking she continually moves closer till our arms are touching and she is almost leaning on me. Is this flirting or could she just consider me a close friend.
If a girl sits next to you and moves closer until your arms are touching, Is that a sign she likes you?
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