@LCBeauty you are in total shock, your life as you know it has been turned upside down. I’m so, so sorry, this is awful beyond belief.
You don’t have to get a divorce yet. You don’t have to do anything yet except take care of yourself and your children. That is your priority. Give yourself time to absorb what has happened and get into a steadier mental space, you will need to think clearly and that is difficult now. If you can get support from family or friends, get it immediately. At present you need to survive. It is more than likely all you can cope with for now and that’s OK. It really is.
There is some stuff you definitely need NOT to do:
Don’t do anything impulsive designed to ‘win’ him back. He’s in the middle of an affair at the moment and not the person you thought he was. Whatever he says now will be damage limitation, trying not to look like the bad guy and minimising everything to make himself feel better about what a shit he’s being.
Don’t call him any more, he has gone to OW leaving you in agony and to pick up the pieces alone. Later on you will regret calling or begging and pleading massively. It’s only feeding his ego having two women fighting over him, it’s the part of the fuel of affairs, the forbidden triangle.
Do not try to make sense of this, there isn’t any. It’s a waste of mental energy.
Do not waste time now by pretending the status quo will return just yet. It might not. As what he has done starts to really dawn on you, you might not even want the status quo back. You might not believe that currently, that’s all you want because the alternative seems incomprehensible and horrendous. I get it OP, I really do. However, in the light of that, if you don’t know your financial situation, as soon as you feel calmer, find out, get it all out snd make copies. Tomorrow get a free appointment with a solicitor. You don’t have to tell anyone, it doesn’t mean you are going to get a divorce.
It’s all about protecting yourself and your children now.
He won’t expect to be ignored, he doesn’t want to be ignored. Ignore him. Go silent. He left, he betrayed you, he chose these things. He can call you. You’re going to get neither truth nor sense out of him currently, I assure you, his words are meaningless.
Take care OP, you and your family are the most important now. He can take his consequences.