Why is having male friends so confusing?

I have this male friend, and we agreed to keep it at this level after telling him I liked him. Keep in mind he mentioned not being attracted to me in that way. I've moved on with my feelings, but interestingly, he gets jealous about me being around other men. Like when we are in a social setting and I am talking to a guy, romantically or not, he interjects himself in the conversation. Or even when I talk about my other male friends he visibly gets jealous and disinterested. Its weird because he's in a relationship but acting like this. You would think being my friend would mean encouraging me to explore romantic options and letting me talk to other guys. I understand male friends could be protective but there's a difference between being protective and being jealous. So am I being dramatic or is it possible he may be attracted?

He doesn't like you at all
He does like you
He obviously doesn't know what he wants
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Why is having male friends so confusing?
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