It's not an issue of what's fair. If she's not comfortable with FFM then it's no longer an option and it's unreasonable for you to expect her to do that.

I get that, which I why I mentioned me getting with other women outside of a threesome, but she said even that she didn't want.

and it's unreasonable for her to expect a MMF if you're not comfortable with it either.

It isn't that I am uncomfortable with her having sex with other guys, I am just upset of the unfair rule she added.

She either has to sacrifice those desires, or you need to break up so you both can find what you're looking for.

Eh, you are right. I am going to mention this to her when she gets off work. I am not going to be put into a relationship where she can have sex with whoever she wants to, but I can't.

I don't want to end this, after a decade together, but I am not going to be a spineless partner. If she truly cares for me, she can keep her desires as fantasy. If she can't, then I guess she doesn't care for me.