Why are you so insecure?

I recently listened to a podcast that said if a female chose to have male friends that she has or in the future will have some kind of relationship with him that will be more than platonic. Or that the guy is gay and is her her bgf (best gay friend). To sum it up men and women can't be just friends.
I don't think this particulary is true, however it has always been a hindurance in any relationship that I had. I would usually get the dumb questions like "why is he texting or calling you so late, why is he in your top friends, where's his gf". And my favorite is "how many times have y'all gotten together". This would result in me screwing up my face. And saying " no were just friends nothing there between us" then I would "say why are you so worried if I'm giving you my time. Don't be insecure" and if that would continue I would say "this isn't goin to work because you keep looking for a arguement and I'm waisting my minutes".
I used to wonder if that kept guys away in my high school days because if you seen me in a hallway or out shopping or going to a party I had about maybe 3-8 guys and we'd all be chillen and I was never being disrespected by them so I enjoyed their company and were still friends to this day.
My motto is bros before hoes and if I'm not trusted around them it's not my fault it's the guys insecurity and the gf to these dudes never had a problem with me to my knowledge so if it's not broken don't fix it.