Am I over thinking this about him?

I have a buddy with benefits. At first we were having casual sex. I have noticed now that he keeps quite an eye on me. He is the one to always see my posts n' read them all n' we spoke after a few days gap and I made a joke about another guy. He later on asked me if I have a boyfriend now or not. He also seems to become a little bit agitated if I talk about any other guys and dismisses the conversation. Am I overthinking that he has slowly built emotions?
You are over thinking
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You are not over thinking
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Am I over thinking this about him?
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