Give up the threats. Decide what you are going to do and DO IT.
GH...I think the above is good advice.
To be honest, I think that whatever you do your W will try to keep you dangling on. She is as afraid of your M ending as you are.....but she also seems to be afraid to invest in just you.
Would you trust this woman enough to have children with her at the moment? In the future? Do you want a family?
I can't work out why your W is being like this. Inside I hope that it is because she is confused/ afraid of/by commitment. Unfortunately my gut tells me, from what you have posted, that she is just attention seeking and it makes her feel good.
However, whatever the reason, in the interest of your own sanity you need to bring this particular chapter of your R/M to a close.
If your M is going to survive don't you want one with a different dynamic? In order to get that I am sorry to say, I think your W is going to have to undergo some pretty radical changes, and for that to happen you are going to have to stand firm.
I actually am quite hopeful that you could resolve this if you were firm with her and showed her you weren't going to accept the situation as it stands at the moment. I am sure if you move on she will follow.
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength