What does it mean when a guy says he's not jealous?

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what does it mean when my guys says he's not jealous, I could hang out with anyone . like if a random guy adds me on Facebook and starts talking to me or wants me to hang out, or guys I made friends with from class say they want to hang out.. first he says he trusts me because he knows I won't do anything. then I ask if he would be jealous he says no. jealousy is a worthless emotion .
What does it mean when a guy says he's not jealous?
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