Why dudes are so stupid & insecure?

I was in club and flirt with one sexy girl she flirt back so we exchange numbers. And than her boyfriend came to know and threaten me I will see you outside club. Bruh if she loyal to you than she won't flirt me back. I'm helping you to know she is for fun. Not loyal. 😜😜
Why dudes are so stupid & insecure?
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