Truth be told, I have mixed feelings about going dark too. I've ignored the last phone call, voice mail message, and text message from my husband, and now it's been about 6 weeks since we've spoken or otherwise communicated. Sometimes I think I'm just telling him that I don't care and I'm making it easier for him to move on without me. I miss him all the time and just like you, I don't want to file because I'm not the one who wants out. It's hard not to get discouraged sometimes, but know that I am in a very similar spot as you--so you're not alone... It's difficult to know how long we can do this. I think when it's enough, we'll just know.
If you don't mind my asking, how long have you been married and when did you separate?