What does it mean if a guy hits you up, you respond, and then they never every reply?

This happens to me so much and I don't get it! They will say hey, I will say hey, and then they will never respond. Or they will hit me up, keep conversation for like a few minutes and then stop replying, only to do it again a month later or so? It just doesn't make sense to me why they waste their time doing that to me. Any theories?
he's not interested
he's a player
he is scared
other reason (comment)
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What does it mean if a guy hits you up, you respond, and then they never every reply?
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