@GutlessFury please don't worry, I didn't think you were diminishing my pain!
I think the counselling really helped me reframe it. Up until last week I was doing exactly what you did, getting on with things as normal and pretending it was all ok except for the tiny fact that my ex had binned me and is seeing someone else. But counselling really helped me reframe it, and I started putting in boundaries which ex really did not like, and one night when he was tediously trying to re-tell me why we should do something the way he wanted, I suddenly saw him from a very unflattering angle.
I stopped blindly believing his narrative, as I had been trained to do over 20 odd years.
It still makes me sad when I see a chink of his former self, and that he's not my person any more, so I don't really have a person except for myself. But I'm not longer sure he ever was my person because he wanted me to change to fit in with what he wanted, rather than wanting me.
And as it turns out he's behaving like a monstrous twat right now, and I'm happy to distance myself from that! Although I'm in tears now, so still all v wrangly, but that's my new narrative and it feels more comfy than "it's all my fault" at least.