There is a big difference between liking a girl and loving a girl. Some people confuse these two words. In two short paragraphs I will explain each side.
When you like a girl, you will do anything to be with her. You will immedietely make a move without even thinking. You consider her as a possession and only look to her as a source of happiness. You main priority is for her to make you happy.
When you love a girl, you will do whatever it takes to make her happy. Before expressing, you must think about her reaction and think about effects. You would glady experience pain just to see her happy. Your happiness is secondary. Your main priority is to do everything that is right for her so that she will happy.