Genuine question.. What is the root of a healthy crush or love towards another person.

I 18m have a crush on a girl who is fun, interesting and all i cud ask for, and I enjoy my time with her. I know full well that I can show her love and affection if we date. But just somehow I feel this crush isn't stemming what can be defined as healthy. I feel it stems from loneliness that I have. I feel it stems from the feeling of me wanting to love someone and being loved by someone. I want to understand how to develop a healthy crush and to do that I wanted to know what forms the basis of a healthy crush.