the 'best friends' ONLY thing with the opposite sex doesnt really work because youve found someone that you can confide in, trust, and feel completely compatible with. didn't work for me and my current SO (best friends now dating). i think the ultimatum is a good idea. either she lets you know how its really going to be or you move on and find someone that can appreciate you romantically as well as be your friend/partner. good luck with it
