Thinking of you in this tough time. Its OK to feel like you want to move on - its probably part of the process, and from my experience you will cycle through wanting it to be over, and wanting to make it work many times.
I think you will have a new and different perspective when and if you separate too. I guess I'm just saying its normal to feel up and down, black and white, but give it time. With time you will be able to separate the emotions away and make a clearer decision.
I think true love is giving someone the space to be who they really are. Not trying to change them, just really accepting them as they are. You deserve to be loved like that, and your wife deserves to be loved like that too. And then once you realise you cant change them you get to choose if you want to stay married to them.
Its also possible that whatever issues your wife is facing, and the unhappiness she is dealing with, is clouding her true self, and given the time and space she will have the freedom to express her true self again (and hopefully that is a similar person to th e one you fell in love with).
Dont fear separation. Sometimes both parties really have to experience what they stand to loose, before they can both commit again.
I'm really sorry that she is treating you the way she is.....
