Nini, I agree with Charlotte, I think this will be your fault regardless. It's not about, and will never be about, whether you did or didn't put enough effort into the marriage. It's about him. You going to the counselling sessions or not makes not a jot of difference to that. So I say do whatever makes you feel most comfortable, regards continuing to go or stopping. Put yourself first.
I'm just on to rant a bit. [rant claxon]
NSDH texted about meeting up to talk today. Asked how my coffee with friend went. (A boring point, but relevant!) I said it's been rescheduled to Thursday, said didn't want to have just lunch (no real desire for smalltalk with him), but we needed to sort finances so let's meet. He said he'd come to the flat. And which friend was it? I said, no, rather meet you at the restaurant (and ignored request for friend disclosure). He phoned to say he was already at the flat, in carpark. Could he come up? And why wouldn't I tell him what friend it was?
I got annoyed at this point. I said it didn't matter who the friend was, I didn't have to tell him. He accused me of being secretive, and then said, provocatively: So, what's his name?' I told him he was paranoid, yadda, yadda. Ended up putting phone down. (there's no real modern-day equivalent of that, is there? Really, I pressed the 'end call' button in an irate way.
])
I wouldn't answer when he phoned again, but then he texted saying I was being silly, he was just being a bit paranoid because of the situation, to come let him in. I said No, didn't want to talk to him now. And he wasn't paranoid because of the situation, he's always been like this. I watched him drive off. He's now in a major huff with me, telling him I'm not being fair because I'm not letting him have DS2 until the afternoon on Thursday. But I've already made plans, with my mystery friend, and he didn't announce he wanted DS2 on Thursday until after all this happened. Plus he doesn't actually have anywhere for DS2 to sleep at the moment, as he's had to temporarily give the travel cot back. But it's me being unfair. Obviously. So much for being soooooo sorry for being nasty and abusive. That lasted about as long as could be expected. 
In other news, had my oldest friend over for cuppa last night, had interesting and insightful chat about parents/mums/family. I've always held my mum up to be one that everyone thinks is amazing, lovely, just the mumsiest mum ever. My friend, who has been my friend since I was 12, been to mine for countless meals, sleepovers, been on holiday with my family, etc, etc, etc - she said my mum's very nice, but there's no warmth there. She said there's always a distance, and it's always obvious that she's awkward about touch (a hug for a greeting, etc). I was stunned that someone else could see it too. (But she said the same about me and her mum, that I've had insights that she's been amazed about.)