There are four simple tips on how to win over a girl and make her happy.
1. Girls like pushy guys. You can't stay in your comfort zone in a relationship. Continue to seek the location of the girl every day and you will be surprised with what desire she will reciprocate you.
2. Remember that girls love romance. Make romantic gestures like a candlelit dinner or a bouquet of flowers for no reason.
3. Girls tend to have higher standards of hygiene than boys and can easily become nauseated by smells, dirt or other lack of grooming. A girl can be scared off by an unpleasant smell or dirty clothes. She may also think that next to you she will have all the cleaning in the future house.
4. Do not flirt with other girls if you are in a relationship, otherwise you will show that you prefer someone else.

From myself I will also say, if you are happy, then your girlfriend will be happy. The main thing is to take care of each other.
If you have additional questions on this topic or if you do not agree with me or just want to discuss, write to me via chat or email. I will gladly answer all your questions. Have a nice day. Valentine.