Well first of all you should be properly focused based on what the scirptures have to say.
1 Cor 13 said:
4Love is patient, love is kind. It does not envy, it does not boast, it is not proud. 5It is not rude, it is not self-seeking, it is not easily angered, it keeps no record of wrongs. 6Love does not delight in evil but rejoices with the truth. 7It always protects, always trusts, always hopes, always perseveres.
Love is patient: Be patient with her. Understand her needs.
Love is kind: Obvious. . . treat her well and kindly.
It does not envy: Don't become jealous of anything she has, but always be proud of her.
It does not boast, it is not proud: Don't feel the need to defend your pride around her. Remember you are lucky to have her, always be open and honest with her. Don't overly concern yourself with your own accomplishments. Don't try too hard to impress her.
It is not rude: You try to be polite with her no matter what the situation. Even if you are fighting.
It is not self seeking: This is the big difference between immature love and mature love. You should concern yourself mainly with what benefits the two of you as a couple or what benefits her.
Its not easily angered: In other words. Let the little things go. Some things about her eventually may start to slightly annoy you. But think about if its really something worth getting upset about.
Keeps no record of wrongs: Anything previously that she has done wrong to you or otherwise NEVER get held over her head. There is no "keeping score" here.
Doesn't delite in evil but rejoices in truth: Rejoices in Christ and dislikes evil and harmful things. Never attempts to deceive.
Always protects: Always looks out for eachother. Not just from physical harm but spiritual harm, mental harm, etc etc.
Always trusts: You trust in her and her abilities.
Always hopes: To belive all things will turn out for the better in the end.
Always perserveres: To belive that if you remain faithful to one another that you as a couple can get through anything you need to through the help of God.
Now for a few personal pointers. Always be honest and upfront with her about everything.
Be her best friend, Do nice things for her, but do those things which come from the heart and not trying to hard to impress her by anything, including your pocketbook. Do those things on important dates as well as sometimes randomly, just cause you love her. Creativity helps here.
Communicate, communicate, communicate. Be completly honest about your feelings with her. Make time for her, and put her on top of your list of priorities. I don't care what time of day it is, I don't care whats on TV, I don't care how many hours of sleep you havn't had. If she
REALLY needs to talk about something at that moment, then thats what you do.
Be patient with her, especially during her periods. As you become closer you may become more and more exposed to her feelings during this time. They may be annoying and they probably won't make much sense. And they may involve random grumpyness or even anger towards you. Listen and politly speak, and have extra patience during this time.
Find out what she likes and doesn't like. Try to be a servant to her. Compliment her on anything as long as its honest. If she looks beautiful then say so. If she's like my fiancee and always looks beautiful, then say that.