Spiralling towards the end

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How do you know when you are nearing the end? Once trust is broken and there is betrayal from so many lies and so much deceit, is there any way to restore trust? Is there any going back?

My partner is in therapy and I think there has been a breakthrough, but I am not sure I can ever look at them the same after my trust has been betrayed and after the things I have found out. I worry they are too empty inside and that I will always feel their hollowness. We have been together a long time and have 3 kids together, but things that have come to light have changed the way I see them.

Can anyone share at what point they knew they had had enough and there was no going backwards? Can love be restored when the pain that has been caused runs so deep?