Personally, I prefer boys who pay attention to details. For example, if your girlfriend is unwell, you should know and care about her at the first time, take her to the hospital or buy her medicine.
Another example is to respect her and what she likes. Even if you feel childish, don't say it, let alone attack her.
Also, don't doubt her. For example, if you see her getting closer and closer to other boys and tell two jokes, you won't be happy, and you won't even let her get in touch with any boys except you.
Always make her feel that her position in your heart is the most important. But you can't make her think you're haunting her. In the early days of love, they may be together all day, but after the love period, don't take this way of getting along as a habit to ask each other, you must know the right distance to produce beauty.
Finally, if you want to catch a woman's heart, as a man, you must be outstanding and make progress. An attractive boy is definitely not thinking about how to please his girlfriend all day. A serious boy, an enterprising boy, attracts most girls and makes his girlfriend happy and proud.