Normal jealousy?

So i work with my best friend.. Straight male.. Is super secretive about his dating life.. No details etc. Nothing progresses past a few dates so he feels nothing to tell.. But then insists on knowing my dating life because i tend to go for "losers" according to him. And there's one specific guy working the same building who is overly flirtatious but i dont believe there's interest... He just seems like that with anyone female... My friend gets very snappy about how i allow this person to hug me or randomly throw flirts... And my best friend gets upset when i engage in playful banter with anyone male in his company. He says im being disrespectful because im ignoring him. These are just very simplified ideas of his behaviour... he's not weirdly possessive but he is creating massive confusion... Important note i previously told hin i had feelings for him a year ago... But took it that he wasn't interested and was newly divorced. So haven't brought that up again. It feels like jealousy but why on earth would a guy act like this towards just a friend

Normal jealousy?
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