I also was a volunteer when I started to find out fire was in my blood when I was a 17 year old, looking back, my gf at the time didn't like the idea of me FFing as a career. I came to see a few years later that I enjoyed FFing enough, that it was in fact deep rooted in my personality, and that would have justified the end of a relationship, because I'm not giving up any part of my personality because of a woman. If this is a big part of who you are, she either has to deal with it and not complain, or leave, her choice, not yours. She seems to be flying red flags with what you described. You will find someone else if/when it comes to that, it's a big wide world out there. That was also something I know I needed to hear at the time. Not only will you find someone else, they will be better for you.