OP, don't dignify his texts or attempts at communication with replies. Ignore ignore igore. If necessary, switch off your phone - he had o compunction about doing that, did he?
He will spend a lot of time trying to weasel out of any responsibility, and tbh, I wouldn't put it past him to set conditions for his eventual return to the bosom of his family.
At the moment, you need some space to get your head round it and decide what you want to do. May I suggest that you text him in the morning telling him that you want a week to consider your position, and that if he had any respect for you he will not contact you in that time.
See if you can get a free half hour with a family law solicitor to discuss your options. Do you want divorce? Would you prefer to try to mend it? That would be dependent upon him taking responsibility for his actions and being truly remorseful, of course.
You probably can't decide that with certainty atm, which is entirely natural, and one reason why you need some space from him.
Talk to people. Tell them what has happened. You will get lots of support and will need to be able to discuss your feelings in rl. Tbh, it is entirely possible that he will tell people his own version - and heaven knows what that might be. Better to tell people the truth yourself first. They will find out, and rumours can be very stupid if there are no facts (I remember my cousin died a year after his mum died - the rumours were that he'd killed himself because he couldn't cope with life without her - he was nearly 40 and had left 'home' years before, was on the point of marriage and had just bought a house with his fiancee. Nothing further from his mind than suicide!).
So get the truth out there before people start thinking up stupid things.
Above all, be kind to yourself. You will feel up and down and let yourself do that.
Focus on your children, and try to do one nice thing with them every day, if it's eating pizza and ice cream on the sofa watching a film, or going to the park.
Let yourself be upset and wobbly.
Eat. Bananas contain pretty well everything you need in terms of nutrition, so even if you can't cope with a meal, eat a banana. My doctor recommended that my mum ate banana liquidised with ice cream every day when she became too ill to eat proper food.