I took a different route. My girlfriend gave me a similar ultimatium. Guess who ended up getting kicked.
I've had my share of long term relationships. I know that, no matter how much you are in love, how blind you are to everything else because of a women, your relationship will probably fail. (I'm being a realist, not a pessimist).

They say that more then 50% of all marriages fail. Ever do more research? The odds of you and your woman lasting as BF and GF are almost 75% against you. If you marry her, then your odds get a bit better. They drop to 50/50.
On the day she gave me that ultimatium, I had called around and found a place to move. Luckily I was on a month to month basis with my rent and was out in 24 hours. Didn't tell her where I moved too. I think she regretted the incident as she still to this day calls me.
My grow was bigger then yours. I've been saving up so I can start up my own business. Unfortunately, MJ is an intergral part of my savings and once I go legit, I will hopefully have achieved my american dream. Your grow wasn't as important to you as mine was to me, so I can see how easy that desicion was. I hope your choice was based on a comprimise, and not an ultimatium like mine. Any woman who tells you what you can and can't do, is not worth being with. A relationship will fail without comprimise. Good luck.