What your girlfriend is saying is that she would like you to pay some more attention to her. Plain and simple.
Dial back the time you spend on the forums and spend a bit more quality time with her. Maybe you can spend it talking and let her know that this is something that is important to you and that you enjoy. It is a much more productive hobby than playing video games and furthers your knowledge on a lot of subjects, not just pot. What you learn here can be transfered to many other things in your life.
I bet if you logged off for a bit and cooked her dinner and made a night about her it would quickly change her attitude.