It’s normal brother, actually it’s a good sign.
Sadness is slowly turning into anger, they are contrasting emotions energy wise, one is draining and the other is explosive.
That’s your system resetting trying to find a balance.
It’s a process that both memorizes the pain, assess the damage, tries to re evaluate your own attachment and risk assess if it’s an asset or a liability.
And is also reassigning your woman her correct value in your life.
You loved her so she was first.
What you are experiencing now is your system reassigning her worth, is basically erasing her from your priorities and fingerprinting her flaws as the marker for "worthless women" so whenever you spot cheater traits in a potential new partner you know exactly what she is: a transactional bed warmer at best, an abusive person who doesn’t deserve any investment from you.
She is there to exploit others for validation. so you may either exploit her for what she offers without giving her a cent, or you can ignore her completely as she is irrelevant.
You won’t have much mercy on cheaters after being cheated upon. Is normal and likely healthy too, avoiding dangers and traps in life is a survival skill.
Anger makes you reject the disgusting behaviors. Sadness might lead to low self worth and embracing the very same behaviors that harmed you.
The healing point will not have anger, sadness, or resentment. You just won’t care of your cheater or cheaters.
They become irrelevant. You can spot them, assign a precise human value to their worth, and keep them from being able to disrupt anything in your life.
Wether you are going to use their flaws against them or simply ignore them and discard them, is up to you.
Infidelity is a marker of shame, not for the loyal partner, but for the people capable of.
You are just learning how to identify, mitigate and remove.