Good to let these thoughts out. Going through this was unlike any pain I could have imagined. That was over 1.5 years ago. Now? I look back and not only were things not as good as I saw them, or rather say, chose to see them, it turns out that all of the pain, darkness, etc was exactly what I needed. My ex wife, fake lesbian, lied, cheated, gaslite me from here to the moon (still tries to this day, but is slowly getting the picture that I simply do not care anymore).
I am not saying you will experience this or this is the case with you. I am simply saying I was you, didn't see how this could get better. Not only did it, but life is better now than I ever imagined it could be. Give yourself grace and time. This is in a way, worse than death, because the person still lives, but the version you knew is gone forever and the mind has a hard time reconciling that. No closure/point to move forward from.
Remember, no matter the pain, you have a choice each day. To learn from this, or carry it. The further you get, the easier that choice becomes. For now, give yourself grace and time, but know recovery on the other side can come sooner, if you choose to learn from it, vs carry it when its VERY hard to not to carry.
Be well, write anytime. It does get better. I/we are all you. You are not alone.