My girlfriend keeps telling me to be a better boyfriend.. how do I do that?

Can you tell us a little more about the relationship and what she complains about?

There are a lot of qualities that a good boyfriend shows. I can name a few, but I'm sure I won't be able to name them all.

No one is perfect, but a few good traits:
* is respectful and courteous
* is caring
* gives her space
* Is a great listener
* Is confident
* Builds his girlfriend up and never puts he down.
* Is fun to be around
* Is supportive
* Is attentive

Pay closer attention to her, and be a good listener. Then you will know what she wants and how she wants it.

Well u need to buy her nice things and complement her every chance u get!. even if its something stupid like your hair has the most beautiful shine! And put a lot of feeling in to the sweet stuff u tell her.