I won't tell you how many divorces I've been through (its more than 1, less than 3).
This by no stretch of the imagination makes me qualified to give you anything other than my opinion, based on my experience(s).
Divorce sucks, I mean really sucks!
It sucks for you, for your children, and believe it or not - whether he knows it now or not, it sucks for him too. But in my opinion, it doesn't suck nearly as bad as living the rest of your life in a loveless marriage; and that applies to all parties listed previously.
My best advice is to:
Follow Crompsin's advice as others have said. Keep focused on the task at hand, because once this gets into lawyer's hands, its all business.
I don't know what you've tried to "make this work" and its really not important. If you believe that your marriage is over then that's all that matters. Only you know what you really feel, but "feeling lonely" doesn't seem to be the best rationale for hanging on.
I've never met you - hell, I haven't even had a conversation with you or replied to a post of yours before. But regardless, I'm willing to bet that you have a lot to offer someone! You deserve to be happy, to be "loved", and to make the most of your life just as much as everyone else does! Focus on the positive, the future you and your daughter have before you, and try not to dwell in the past!