Don't do anything just yet. Like kick him out.
You need time to think and that is hard to do when your feelings are raw, shocked and all over the place.
What you need is a two point plan.
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Hope for the best
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Prepare for the worst
For the second point you need to tell the part of you that "feels" to stick to their task, which the hope one.
With you "think" head on, you need an appointment with a solicitor/legal advisor NOT to start divorce proceedings (run from any that appear to want to push you into that) and get a "hypothetical divcore audit", so you have an idea of what you can reasonable expect in terms of child support, division of assets etc were you to end the relationship.
Then you need to find put what benefits you would be entitled to.
Anything that would impeed leaving needs to be addressed with a plan B. Working, childcare, any other lifestyle issues that tie you a life with your husband. For example You don't need to run put and get a job today, but updating your CV and checking out the options interms of childcare and availble jobs is worth the effort involved.
Do not get cuaght in an "I can't eat the elephant on my plate" trap.
One day, one small bite, start with the ones that involve nothing more "chewy" than making an appointment. So your role is a passive, listening and learning one rather than active and doing. IE going to see a solicitor.
You will be OK love, one way or another, the shock and the pain will wear off and leave you ready to face either restitching your relashionship with a new thread, or cutting it loose.
And there are hundreds of women here who will listen, offer a shoulder, pick you up when you are on your knees, play devils advocate so you can be sure that what you think and feel match, and care.
You are not as alone as you believe yourself to be.
Give yourself time to work put what you want ot do, and use that time to make sure that when you decide, you are in a good place to begin whatever you have decided.
If I could reach through the screen and give you a bit fat hug, I would. I'm so sorry he has done this, and I absolutly understand how very much it hurts.