thank you for sharing your question with the Wefugees Community!
Regarding the first part of your message: If your girlfriend receives a refugee status she can indeed bring close family members such as her husband to Germany through family reunification. But this only applies if you are already married. She can´t bring you to Germany via family reunification if you are not married. Without being married it can be very hard to bring a boyfriend to Germany. Also note that there is also the possibility that your girlfriend might not be granted asylum/refugee status but a "lesser" status. If this happens family reunification might not be possible at all. So there is a risk.
Regarding the second part of your message: If you would come together to Germany to apply for asylum there is the possibility that the two of you will be distributed to different cities within Germany. To make sure you stay together during the asylum process - again - it would be very helpful if you would be married already.
I hope this answer was helpful for you. I am sorry I couldn´t give you any good news. Maybe someone else of the Wefugee Community has some helpful thoughts on this topic.
All the best
Note: Please keep in mind that we can´t provide qualified legal advice via the internet and that any information given can´t replace such legal advice.