What do I do

My “girl” asked me why I liked her today. And I practically poured my heart out to her. I got a very mild response from her which didn’t make me feel the love back that I have poured into her. And then she continues to say “I don’t think you have the love for me that you say you do.” I mean what do I with that? I’m obviously enthralled by this woman and don’t want her to walk out of my life but what more can I do to prove to her my love ? I’ve given my all, my time, my effort, my gifts, my love and my patience. I just don’t know what else I can do to provide her with the feeling of love and affection. She sometimes says I’m too nice ? Is this something woman don’t like ? I’m just trying to be the perfect man and she doesn’t seem to get phased by it. Any advice would be great. Should I walk away ?