Love
Most of the time people think how can they earn somebody for that you have to do unconditional works such as care conscious and subconsciously this is the most important part that the person will become yours forever. Never lie or lie only when you are protecting her. These are the things that one needs the most. Being a girl, suggesting you to Respect, Protect and Love unconditional for example try to help her during sickness, help in studies, stay doing something together it can be farming, making plans etcetera. See, the real point is to show your love, in most of the cases, people just tell they like her and skips the part of showing the love in front of world. Trust me.. This is the way to get her in a long go.