Guy I need your advice?

Well, I have been in many situations like that, Where I talk to the girl almost every single night on whatever it is, Then comes the question... "Will you be my Girlfriend?" It takes a lot of guts to ask that to a girl and trust me, it isn't easy. And when you say that to a girl you REALY REALY like, and she replies no, all the guy's hopes get crushed, and it will most probably not be the same way again... Even if the girl comes back to the guy, the guy's mind is still set on when the girl said no. It's like some instinct for guys...