What makes a man, a man?

My girlfriend, in anger said to me "you're not even a man" it kind of stuck with me. I do check up on her from time to time, I am good sexually but still I got this... On asking how can I be her ideal man, she told me "now I need to tell you that" please help me out, she said I need to have strong masculine energy within me for being her ideal man... Please help me out i really love her and don't want to lose her because of this. All suggestions would be appreciated
What makes a man, a man?
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