Why is this coworker start being all sudden so concerned and seem like he care about my mood and how I’m feeling?

He never showed me any concern or that he cares before and I’ve been here at the company for longer than him and he never really even spoke to me before he started recently and it would be short to small conversations and out of no where he so concerned about my mood and how I’m feeling and even told me to smile or how one day he may say something like it’s good to see you in a positive attitude etc like we come to work and he has his own family to Worry about yet he out of no where seems to care so much about my mood and personality when majority of the people there are sad or unhappy themselves seem like

Updates
7 mo
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Updates
7 mo
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Why is this coworker start being all sudden so concerned and seem like he care about my mood and how I’m feeling?
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