I'm a lesbian and my girlfriend just came out as gender fluid. I'm conflicted — help?

I can't imagine my life without her. She means so so much to me and this change has stressed me out so much that I've actually become physically sick. I like that she is androgynous. It is very attractive to me. She cut her hair short and she's strong and she has a lot of tattoos and piercings, and she's never been very feminine while I've been with her. I think she looks absolutely stunning in heels and a blouse but I love her just as much with her new look.

She just came out as gender fluid, meaning she is no longer a she. She's a they, she isn't my girlfriend. She's my partner. I'm okay with that — I would rather call her my girlfriend but it's not a big deal. I'm just scared because she's told me I have to decide whether or not I'll still love her if she binds her chest or, in the future, starts taking testosterone. I really don't know how I'd feel about that… I love her voice, it's soothing, and I don't want it to change. I am a lesbian, and this isn't fair for either of us. She can't ask me to enjoy something I don't enjoy, and I can't tell her not to be herself. She says she's pretty sure she'll never want to take testosterone, but she's thought about it. She tells me that from my reaction she feels she is not getting support and she feels like a burden, and I feel terrible. I love her, but this change is really hard for me to get used to.

PLEASE somebody talk to me. I'm sick with the flu and these severe levels of stress are taking a toll on me.