He won't be able to take the children off you so get that out of your head right now.
I've been trying to remember what my first week was like after "THAT" happened, but I can't remember much of it to be honest. You just plodded through it.
I still remember the feelings you are going through now though, very well. You feel like such an utter fool, embarrassed, drained, naked, bruised and the sadness, god that sadness, it felt as though it would never go away. Add to that mix a burst of anger and you are left feeling like a total mess. You want to cry, scream, shout, physically hurt someone or something but really you can't even face getting up from the chair you are sitting in.
The first three weeks or so are a blur and I wish I could remember everything more clearly so I could help you, but I can't. I was in Robot mode. Most things were done automatically - like everything was surreal, you're living like you do in dreams, that feeling that nothing is quite real. It's a strange one.
I think I must have spent at least a week in total just sat in the kitchen with the Ipod in, desperatly dreaming of a situation where this wasn't happening.
OP, these first few days are the worst, more so than the day it all falls apart. Be prepared for this to last a couple more days yet and then you'll get angry more than you are sad, and then something happens within you. Something snaps and it dawns on you that no fucker will ever do this to you or the kids again and THAT'S when you get moving. Try and rest, easier said than done as I doubt you're sleeping but you need to just sit if you can. Mentally you are everywhere, emotionally you are drained and it won't be long until you want to cry, but theres nothing to cry out...
Tell your son, he needs to know. He'll know something is desperately wrong anyway, tell him the truth. He'll be hurting too but he'll need to know why more than he will getting comfort and not knowing what's set it all off, he'll be blaming himself at some point.
Tell your dad and as many people as you can. You'll be repeating this story for a long time to come. Let as many people know as possible and get it out the way now. Don't leave it so when you are going about your normalish business and then you've got to explain it all AGAIN, you'll be right back at square one because it'll hit you like a ton of bricks.
Stop pretending everything is alright with everyone. You know it's not, they know it's not, some will want to know the gossip and other will want to helpo but are frightened to mention anything in case they upset you.
Talk. Talk about this as much as you, even you will get sick of talking about it but there'll still be a need to talk about. You are trying to sort it out in your head, to do this you need to talk and repeat, talk and repeat as many times as is needed.
You are not trapped. It feels like it because everything is still such a mess around you. There are ways through this but you can't see it as you are hurting too much, you're still feeling betrayed, hurt, embarrsed, scared, sick, tired, drained, angry, sad, miffed and numb ALL at the same time. It's all still very very raw, but please believe me, you are not trapped.
I'm 4 years down the line from you are now, slightly different circumstances but still the same abandonment.