I'm sorry C-nut. I know the pain and the betrayal, wondering if anything was ever real.
I honestly can't tell you how I've done it, but I have healed, with a few scars left behind. I healed with a blaring A in my face. With my infant daughter spending time with OW, with them moving in together, through their marriage.
Betrayal is a very tough one to get over. But it is doable. What you know or knew to be true is true. don't discredit what you felt and what you had at one point.
It is a process that can't be rushed as much as we want it to. I do suggest you stay in IC to deal with the pain and the feelings all over the place.
It does fade as long as you don't allow yourself to get stuck there. But you still have to get through it, you can't get over it.