What does it mean when a guy is suddenly concerned about your health?

i didn't go to school for one day cause of low grade fever. suddenly this guy, which happens to be my classmate, randomly texted me this "I heard that you have a fever how are you feeling?" I found it weird since we haven't texted each other for quite a long time and didn't expect him to make an effort just like that. I mean I'm not that important to him I supposed. and recently, he's saying things like you should watch your health take vitamins.. stuff like that. seriously, is he planning to be a doctor someday or what?
What does it mean when a guy is suddenly concerned about your health?
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