When you're done you're done, but it's hard not to get sucked back into a vortex of emotions.
We may realize we're done, feel that we're done, and want to be done. Those are all valid.
I whole heartedly advise if you can, cut contact if you can. This will help you heal.
I'm not able to do so, and I can tell you it's negatively impacted 7+ years trying to mentally detach while stuck working with him, and seeing every bit of his life with new women. I wish I could walk away and never think on it again, but I can't.
We ruminate about having been lied to, when our gut told us the truth, but we believed them anyway.
We struggle with the years, or decades of wasted time we spent for someone unworthy of our love, time or devotion.
We are left with all the baggage emotionally, and physically for things they did to us that we had no voice in or part of.
We are disappointed, disillusioned, abandoned, replaced, our trust is broken and our lives destroyed for their benefit and our detriment.
We deserved to be loved, respected, cherished, but we weren't. We are not capable of the actions they had. We would never do to them what they so easily did to us, yet we must go on, heal and come to terms with the horrible reality that they did it with no care for the pain it causes. They move on like we never existed, laughing, living their fantasy sometimes seemingly blissful and unremorseful and we still have to live and heal from things we never asked for or deserved. We are survivors.
Don't beat yourself up for giving chances where none were earned. You believed in the illusion that he was capable of being a decent human being. You were deceived and are facing the reality vs the fantasy we create in our own minds. The death of hope, and happily ever after with them. That ship has sailed and now you must sail alone till you figure things out.
Hugs to you during all of this. May you find peace, and understanding for yourself, that you never deserved any of this.