PLEASE HELP!!! We Kiss A Lot, But She Won’t Date Me

There is this lady that I love so much and I have never felt this way with other ladies that I dated. I asked her out, but she did not give me a ‘yes’. She said she loves me, but can’t accept my proposal. I shower her with love and care, we even kiss most times, she sleeps the night in my house, but we never had sex. I can’t stop thinking about her and I have even tried to go out with other ladies, but my heart is just with her. What should I do?