Why do men flake so much?

I am single and dating. I have encountered men who flake more than I can count. It has become my number one annoyance and it is getting to the point where I just assume that no one will pull through on their word. This has stood true through boyfriends as well as online dating encounters. I do not want to give second chances so I usually just write off these guys because I am like, “If you can’t even pull through on a simple meet up than you probably won’t be there when it really counts!” Sometimes I feel that I am being a little harsh, but I am not willing to settle.

I just don’t understand men. Is it in their nature to flake? Or am I just a control freak when it comes to making plans?