Happy weekend everyone! 
thank you all for your comments.
@Whatdirection yes please re your counsellor - although to be honest I'd be nervous to bring up with my husband that I'd like to start again as I think he would see it as the next step towards us separating perhaps. Although I suppose that would push us to have the conversation at least!
@AMSA thanks so much for your messages, your summary of the position with my husband in your first post was completely accurate.
that after so many years of what has been an unhealthy dynamic for you that you feel disconnected to the love you once felt for him. You very much want to connect with feeling love for both your sakes and for your daughter, to show her a healthy happy relationship but right now you feel too disconnected to make that a reality and cannot even guarantee it will become one.
What you have said above is actually pretty much what I have said to my husband (except you have phrased it much more eloquently than my rambles!). And it has led to us trying to connect, trying counselling etc, but as mentioned, we're at stalemate because of our 'irreconcilable needs.'
It's not a Michelin star meal.
You are grabbing crumbs under the table and you think a McDonalds is the very height of luxury 🍟🍿🍔
Ha! it's so difficult because when we have a period of calm pleasantness (like today; we've just had a lovely trip out with our daughter and he's now thoughtfully sent me off for a rest), it makes me think that I'm overreacting and placing too much importance on when things are not great. When we have bad moments, I'm not able to be brave enough to call it quits. It's almost like I feel like I need to know exactly how much good vs bad I'm going to have to deal with in the future, so I know whether I should make do with it or not.
Which I guess ties in with the point about 'balancing everything up':
So, now, balancing everything up, is it the right thing to stay, or to leave?
If "on balance" isn't enough for you to decide this, why not, when it was last time?
I think if I did manage to assess it all, balance up and reach a conclusion, my own feelings wouldn't be included in that, or at least not with any weighting. My husband's and daughter's (obviously) well-being would be, as would other things like comfortable home, nice lifestyle, happy family times, and so on, and I'd have no choice to conclude it was the right thing to stay. But I don't see how I'd factor in my feelings, as to do that I'd have to place them at the top of the list of importance for it to make any difference to the way the scales tip!
He never, ever questions or undermines how I feel, because... that's how I feel! and it counts... it weighs heavier than feathers, heavier than lead, heavier than logic.
Would it surprise you all to hear that is exactly how the OM is, too 
@FoxgloveSummers I did actually realise after I'd posted, the point about 'dragging you down!' So I guess what you're all saying is sinking in one way or another! He knows about MN's existence as I've mentioned various threads over the years, but he doesn't know I've started one. And I hope to goodness it stays like that! I don't think I'd have had the strength to even keep questioning things if I didn't have you all, so I've never been so grateful for MN's existence!
OP, since you can't have private counselling because it will upset Derek, is there any way you can ringfence some time away from him?
One of my friends actually came up with the most perfect solution - a religious retreat for the weekend! You're basically in silence all weekend, no phones allowed, surrounded by nuns, what could I possibly get up to other than soak up the silence
I'm seriously considering it and quite excited by the idea.
I'm just curious why, if he wanted nothing to do with your individual therapy as you said previously, when he accidentally overheard part of your session and you were adamant that normally he wanted nothing to do with it and went and hid away, listening to music - I'm curious why he suddenly developed such a strong opinion about your individual therapy as to advocate stopping it?
It was over the course of several weeks that he started to feel like it wasn't helping me. Originally I'd started the therapy to help me work out why I was 'frozen' and struggling to show remorse and love post affair, and he was obviously up for me managing to develop those things! But after a few sessions I think he realised I was questioning things more rather than feeling better about him, and started saying that I was in strange/down moods after the sessions. He thought the therapist was encouraging me to be negative and obsess over the bad behaviour, and it was making me label him as a monster and abuser. He was keen for me to forget about the past and join him in being positive for a good future together. After a while of him talking like that and the accompanying aggro over me obsessing over his bad past, I decided it wasn't worth the hassle!