Six weeks is still really really early days. You are not failing at moving on. You’re grieving your marriage, your planned future, your family unit, your trust. Of course your mind is spinning and you can’t stop crying- it’s trauma.
You’re trying to make sense of the senseless. But obsessing is only feeding the pain and keeping the wound fresh. Don’t waste your precious energy on him or her, it won’t give you the answers and it won’t change anything.
He did not choose her because she’s “better.” He chose her because he is emotionally limited, impulsive, or unable to face real life like a grown man. He didn’t face the hard or boring parts of marriage, he escaped to a fantasy. He’s a selfish fuckwit.
Her being younger, child-free, or convenient (working with him) says NOTHING about your value. She represents freedom from responsibility and consequences—not love.
If he moved on that quickly, he was already emotionally out the door before he physically left you. It’s likely his started before, or he left to give himself the permission to pursue it guilt free - it’s shitty and weak and you’ll see him for what he is in time.
He’s doing his thing, you need to focus on you and your own thing. You are not broken. You are feeling all the things that are normal to feel right now. It’s utterly shit but it’s not permanent.
You do need to go cold turkey though - no more searching for her, no more looking at his socials etc.You cannot heal while picking that scab and it won’t make you feel any better or tell you anything good. Block him and set ip an email address for correspondence so you’re not tempted to rage at him - if you act angry and mad (even though you’ve every right to) it’s probable he’ll confide in her about his crazy ex he just had to leave. Don’t fuel it. Let her have her ‘prize’. He’s not your friend so don’t contact him about anything but child arrangements and divorce. The less contact you have and the more you’re in control of it the easier it’ll be to move your mind elsewhere.
Treat yourself like someone who’s been in an accident. You’ve just had your life flipped inside out. Be very very kind to yourself - don’t expect too much too soon. Have you got friends and family to support you? Get some counselling if you can afford it - talk this out, not to him. You need to grieve this, but take it literally a breath at a time, a minute, an hour etc. It sounds like a cliche but eventually it will get better and you’ll start looking forward to a different kind of life without him.
He didn’t leave because you are not enough. He left because he is not enough. Her existence doesn’t erase your value. You are so worthy of love and happiness and you will get back there - don’t give up. You’ll be so bloody strong when you come out of the other side of this. 💛