Guys, What does it mean when a guy friend says he cares “FOR” you?

We was having a serious conversation about him and I. Yes we both like each other we both admitted to it. After the conversation we had is when he told me he cared for me. What is the difference between caring FOR someone and caring ABOUT someone? I know there about the same thing but is there a difference?
Guys, What does it mean when a guy friend says he cares “FOR” you?
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