This is my first time posting here, but after reading your post I felt I just had to reply.
I am looking at this from the other side, a few months ago my husband told me he "didn't want me anymore" and our situation sounds a lot like yours in that he pointed out the we don't have sex any more unless I do it just because I feel like I should. I'd didn't want him to touch me, he felt alone unloved, unwanted etc.
He was right and I know this is going to sound silly but I really didn't realize how bad it had got, I know I should have, and that I should have know I was hurting him but I was so wrapped up in everything else I was just treating him like another annoying thing on my list of things that I need to take care of, I was treating sex as a chore, something that he needed but I was to tired or not emotionally in a place to be bothered with.
What I really am here to say is that, it took him saying he didn't want me anymore to wake me up and realize how unhappy I was with how thing were also. I wish he'd said something before he gave up I know you think she should know or that you've told her how you feel but she may not really understand and if you wait until you've moved on in your head, walk out leave her emotional without actually telling and making sure she knows how serious it is, you aren't giving her a chance to change.
Try a different way to tell her, wait until a quiet moment. Don't accuse, don't tell her you love her, tell her how you feel. Give her another chance. Explain how alone you feel, tell her you understand how hard things are for her and that to her it may sound selfish but you need to be touched, tell her you feel your feelings dying. Tell it's not about the sex, tell you'd be happy not to have sex for now but you need touching to feel close to her, tell you've been thinking about leaving, you don't want to but that's how bad you feel.
I think here is still hope you just need to break though the wall she has up and the way you are going about it now isn't working so try something different because I bet she still loves you and just isn't seeing things straight. If you were to walk out tomorrow she'd be devastated and shocked.
Maybe I'm projecting a little as I know that's how I feel on my side of this but please consider trying something different. The women who loves you may still in there somewhere you just have to get her to see you clearly again and realized that your relationship is important to her too.
