What does it mean when a guy shares his Chapstick with you?

The question is pretty self explanatory. But I have a friend that whenever I mention I need Chapstick gives me his to use. Now to me this is a pretty personal thing someone's Chapstick. That's like sharing a drink or something. So what does it mean? If anything at all.
What does it mean when a guy shares his Chapstick with you?
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