1. I may hang out with your friends like one of the guys or play video games like one of the guys, but I am not one of the guys. I am your girlfriend. Give me attention outside of hanging with your friends, do things with me other than what you like to do with your friends, and spend quality time with me away from your friends. Not as a special treat, not as a holiday surprise, but as a normal part of our relationship.
2. If she’s complaining, or venting, it’s not always because she wants advice or a solution. Sometimes all that’s needed is to vent. So, in those situations, just let her vent.
3. Do not forget to tell your girlfriend she’s beautiful. I feel like so many guys forget to do this. Specially after they’ve been with a girl for a while. Girls love to be reminded that you’re still attracted to them. It goes a long way and it’ll always make her happy.