Why do men go on the defense when you call them out on they bad treatment if you?

Long story short. I met a guy and started seeing him as a friends with benefits, we never really went out on dates. I would as him what he wanted and he would be vague by asking what I wanted and agreeing.
He was texting me daily but I was getting frustrated that he didn't seem to want to meet much.
So I told him to cut the BS, that I knew he was stringing me along, keeping me as a option and that if he wanted casual to just say and actually meet.

His responsive was on the defense, he turned it all on me, I was not asking him to meet, I wasn't showing much interest, not texting him etc.
saying I'm the one who doesn't want serious.

The thing that got me was he never acknowledged my feelings or opogised if I felt that way.

So is it possible that I was spot on and he didn't like me calling him out on this?
Why do men go on the defense when you call them out on they bad treatment if you?
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