Hi Daisy
I have got a very similar thread going at the moment.
I am so so sorry that you are going through this and my heart goes out to you.
My H has formed a relationship with a work colleague (Although he is in no way as upfront as your H and keeps insiting there is nothing in it !) but I am so sad for my DS who is very sensitive and will be destroyed by this. My parents also split up when I was very young (Same age as my DS now) and I think it has had an effect on me and how I cope with life. But then I have had some posters who have coped well and are now happy with OP's.
If you don't mind me asking how old are you ?
I'm 39 and think the thought of being single at this point in my life awful but then again think that to live in a lovelss marriage for the rest of my life as really sad to.
I also think that you, like me aren't rowing with your H in front of your DD that it makes it more bearable, but then I worry that my DS doesn't ever see any affection between adults and will grow up thinking that all parents sleep seperately and never kiss or hug each other.
Like you I am past the point of being nice to my H as he has been so cold to me for so long, it's like a forcefield around me that I just can't get past, and if I'm totally honest I don't think I find him attractive anymore and don't want to have sex, which again is a sad place to be at 39.
We are going to try a trial seperation and are combining it with relate - would you H consider this ? At least it will give you a platform to tell him how you feel, and if you can't sort things out will be a place where you can calmly talk about seperation.
So sorry for you.