So predictable....I did mention to be wary of this in one of my initial replies.
Gracie stay strong and be careful, either he will come begging in a big pity party, or he will try and gaslight his way in with a combination of arrogance and self entitlement, ignoring the fact that he did anything wrong.
Be on your guard. Can you ever have a normal life and a trustworthy relationship with this man??
Imagine a future of business trips where he doesn't answer his phone in the evenings, late work nights and leaving do's. Will you be confident that he's now a committee husband, or will you sit there feeling sick to the core, stomach twisted plowing through his email account?
Will you feel obliged to have sex when you don't feel like it, for fear of him looking elsewhere.
Even though you may take the higher ground, to me, he would still hold all the power.
Is that the future you saw for yourself, when you were 18 and all the possibilities of life were infront of you?
And change your home number - this damaged individual seems to think you have some sort of connection. This needs to be stopped. Or if you don't want to change your number, tell her you will be calling her HR manager in the morning and mentioning harassment, and explaining the whole sordid situation. You have a duty to behave normally outside of work as an employee and this is unacceptable. (You don't have to do this, of course)
Try and distance yourself from it all, sweetheart. As long as he contributes financially as agreed, turns up for the children and proceeds fairly with separation and split, you don't have to worry where he is or what he is doing in his own time. He's a big boy now and he made his bed. Time to lie in it.