Why are guys ego so sensitive?

Have a friends with benefits guy that has put me on a path to have sex with other men, very long story on it. Tonight he asked me if any of them were better than him and I told him honestly yes. Than he proceeds to say that I hurt his ego, I mentioned that he has a new friend that he is close to not dating but does do a lot of things with and that she is probably better than me and he says that if she was he wouldn’t tell me due to my ego. Anyway, that lead to him needing time to think ifwe are okay or not as fwbs benefit friends or not.

So my question is should I have lied and cause more problems told the truth like I did and how it cause issues and why ask me in the first place if he didn’t want a truthful answer? Men please tell what I should have done with a question like that and how to get my friends with benefits friend back and keep him?
Why are guys ego so sensitive?
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