Honestly? girls get tired of "the I need you speaches" and even the "you are so beautiful, I need you, want you speaches". While you may be "considering "your" needs, maybe you are not hearing hers, or paying attention to who she is as a person as well. Girls in the age group you are talking about, don't quite honestly "know" what they want and often they just want to spend time with different men to see what they "do" like.