Have you two broken up yet???
fwiw I'm married, and have much more of a shooting history than my husband. I'm vegetarian and only shoot clays, but do enjoy it.
your gf is entitled to seek advice from a third party. This is a forum where people are free and able to seek advice on any issue that is bothering them, in much the same way an agony aunt doesn't reply to letters by saying "FUCK YOU BITCH think of the children in AFRICA". There are male equivalents out there too.
the compromise is so obvious that it begs belief that you two haven't stumbled on it yet. Firstly, talk to each other more when saving so both parties understand what level of personal expenditure is okay or not. Secondly, find somewhere you can store your guns which isn't some dick extension cabinet nor under the bed ffs. Also, a gun cabinet is generally a bad idea - seriously please do reflect on it. Guns, even air guns, need to be well hidden and out of sight in case of break ins. I know its different for shots, but we have four guns and keep them very well hidden, and of course cartridges need to be stored separately.
if your gf has a genuine problem with live shooting could you not target shoot instead?
so many compromises, so little willing to take any of them forwards.
to the "dp" - the general mantra here is that if you are unmarried and you are genuinely unhappy in the relationship and don't feel respected then just LEAVE. Life is too short! Its the same for men and women, but,obviously this is a female dominated forum. Being MUMS net and all.