My boyfriend likes to squeeze my arm when I wear sleeveless tops. He knows I feel conscious about my arms. Why would he do this?

He knows I do workouts to try to tone my arms. My arms are thicker than the rest of my body and I'm self conscious about it. Why would he squeeze it?
My boyfriend likes to squeeze my arm when I wear sleeveless tops. He knows I feel conscious about my arms. Why would he do this?
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