Sorry that this happened to you. It sucks, welcome to the club that no one wants to join as we say here.
It sucks, pure and simple. I was there, we all were there.
Time will heal it but it sucks. What worked for me, I am only a few weeks ahead of you. I found out 12/22/19.
If you use google open a word document and spew all you feel. Do it whenever you need to.
I am a writer and have been working on a book for months, I have 81k words written on my book.
When I found out about the affair
I have written 90k words in the past three weeks. It helps, just say what you feel.
I write that I miss her, I write that I hate her, I write down every emotion that I have and it fills the page. Getting out helps.
I pray every day. I pray when I know I am hurting, I pray when I need strength. I pray to help me get through the day.
I am not religious, I have had a strained relationship with god for years.
I ask him to forgive me and to help me.
It works. You can doubt it but try it.
Talk to your friends and family. They will all tell you the same thing but you can get your feelings out in a safe place.
You know its bad, you know she's a liar.
I watch a ton of youtube videos. A Canadian psychologist particularly. Do a search for betrayal and you will find many resources out there.
I would tell you to use the healing library but whenever I click the link it takes me to the faq so maybe it works for you, if it does use it.
I am in the camp that your relationship is over, let it die, it died the moment she decided that cheating on you was worth the price.
You were the price. That's how little she valued you.
it sucks but most likely the truth.
Its ok to mourn the loss, you will go through the seven stages of grief, watch homer simpson go through it, it might make you smile.
Your world has been blown up, you question the past and your question the present and you question the future.
What I did was understand that I was lied to at the end and cheated on, so most likely I was lied to through the whole relationship and probably cheated on as well.
I framed my world to understand that if you are given bad data you will have a bad outcome.
She gave you bad data and your good heart made choices based off of faulty information.
You didn't deserve it and you will never understand why.
The simple answer is:
She wanted to, and you didn't matter to her because she is broken, not you.
Stay strong, keep coming back as long as you need to and when you are ready you can share your insights to the next guy that "just found out on friday" it sad but every day I see new people join.
And we all need each other because Betrayal is the seventh ring of hell and without all of us, its hard to see the light.