What does it mean when a girl looks at me to check my reaction?

Anonymous
There is a girl In my class that always look at me when she says a joke or says a swear word. One day she said a swear word and everyone laughed and when I looked at her, she was looking at me and laughing, I felt like if she was checking my reaction. She has a boyfriend but sometimes I found her staring me and smiling.
What does it mean when a girl looks at me to check my reaction?
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