How do you act around your crush?

Well me i just told my best friend that i like her and i was scared but i talked to her and she liked me too but i have told a girl that was my best friend before that i liked them and they just said okay and went on about their business and be sure that you act cool and just tell them and don't hide it, because really think about it if they dont know that you like them then they are going to find a boyfriend/girlfriend and they are going to be taken!