Girls, Why is she touching her neck with her fingers everytime I talk to her?

This girl i like kept touching her neck with her fingers everytime I spoke to her today. On 3 occasions today she did this everytime I spoke to her. She also happened to be going on her lunch break at same time as me, in the last 4 shifts.
Girls, Why is she touching her neck with her fingers everytime I talk to her?
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