What's it like to move from the infatuated/having a crush stage to actual love?

It is better to have a crush, well if you're under 18. I fell in love with a girl once, but she did not want me, so I won't be making that mistake again. Love is a painful thing if the other person does not like you back. In a crush, people are more nervous, but in love, people will begin to feel more comfortable with the other person. Kind of difficult to explain, though.