Welcome, EL, to MarriageBuilders. I found it a relief, too, to discover I wasn't alone or crazy...and to share is to exist, come to find out. So thank you for both.
Have you read the Basic Concepts? About ENs and LBs? To the right of your screen are articles by Dr. Harley about Coping with Infidelity...and why blind trust, believing you won't be cheated on is a form of fantasy...and to affair proof your marriage takes total reality?
You are not garbage...you can feel like you are.
What I don't see in your post is your active knowledge...your checks to know, not relying on your WH for truth...finding out the truth.
And I don't see where you shared the truth, either. Did you expose to everyone, including her family?
Would you reconsider telling your son? When one child knows and not the other, there's the complication of them having secrets from one another...and infidelity is about how much secrets tear us apart from the inside out.
What are you choosing in your life right now? Are you choosing to recover your marriage? Have you read up on Plan A and Plan B? There are great threads here to help you, along with great people.
Confusion is just a signal that you have conflicting beliefs. Not bad or wrong...and you're certainly not messed up. You're in a mess, not one.
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Please keep posting...weekends can be slow...and consider making a signature line with standard stuff...ages, how long married (I know you said, I just like to see it in the posts for easy remembering), ages of kids, length of affair, DDay and status.
Again, to live clearly, we gotta get to our facts. You're not alone. You're not crazy. You are valuable, worthy and whole. You really are. And an A does not erase you...it's can't. It wasn't about YOU...it's a choice your partner makes, and it's really about them.
Welcome.
LA