Why would a girl keep changing his/her whatsapp pic? Would it be to impress someone else?

My ex keeps changing her whatsapp pic from this one pic to others and then back to the old pic. She always used to joke that I changed mine to impress other people. Is she trying to impress another guy?

she recently broke up with me and I'm wondering if it was cause of other guys.
Why would a girl keep changing his/her whatsapp pic? Would it be to impress someone else?
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