Why would someone who knows you for a long time randomly start talking you and acknowledging you?

For instance class mates, coworkers etc. Who would see you regularly for months but only start greeting or approaching you after months or a year of knowing you. Does it mean the person didn’t find you attractive but learned something about your personality or work ethic that piqued their interest?

Why would someone who knows you for a long time randomly start talking you and acknowledging you?
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