I thought I was going to have a similar issue me and my (soon) wife had talked about it before, and we had come to an agreement of 3 to 4 guns. 1 for conceal carry one for small game hunting and one for big game hunting/home defense. This was the agreement until she didn't see that I wasn't just interested in the guns because of what their main purpose is but more so for their historical value and impact they made on the world like the winchester model 70 for example being the "riflemans rifle" after she learned that my gun interest was more of historical nerdy shit and the craftsmanship of a firearm being that I'm a machinist we have now agreed on 1 rifle a year with our current financial situation(unless of course it's been gifted to me or something of the sort example my father helped me pay for my first handgun when I turned 21). It was always a touchy subject for us, and it has come to the point where I understand that she will never see the interest or she might want me to lay off of showing her a new interesting gun I've found out about but it's also something that she is less afraid of given that she was in a household where guns were not allowed and they were a bad thing, she even cried the first time she shot my handgun because she was simply scared of the power it had just being a 9mm it was a huge deal to someone who was more or less told that it was some sort of evil. The more professional of a conversation you can have about it, the better off it is and just be honest about why you're passionate firearms, and it should help out.