Guy rejected my offer to help him but is now very playful?

I offered help to a guy, he rejected it and i took it as a sign that he didn't like me. But now his actions are totally different. We work together so i can see him becoming more caring, asking if i have eaten, went home safely. Although i would have been happy before, but the fact that he rejected my help still stings. Also, he's becoming more playful now after I said I like to joke around. What do you think is going on?

Guy rejected my offer to help him but is now very playful?
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