This is my opinion,
Unusual sexism is a major extermination.
Not all girls have a gold digger.
Girls are less complex as social media / movies show. When he says “no” he means, when he says “yes” he means he too.
It's okay if you want to ask us about periods but don't say "you have mood swings" if we're upset.
You can cry before us, we will not judge you.
We really enjoy it when you share a part of your life, your day, what made you sad or happy. It makes us feel that he trusts us.
We hate it if you ignore it for no reason.
Most importantly I believe that every girl (read people) is different, someone broke your heart that doesn't mean everyone will.