OP, stay close to your thread and his predictable playbook and checklist will be given to you by so many seasoned posters on here.
They are never original.
They share absolute selfishness, victimhood and outrage at their core.
They oscillate between grief, outrage, victim hood, begging, nasty to threats of self harm, all in growing desperation to get you back in line.
I really hate writing this but I believe his treatment of you came from no longer caring about you at all, but simply being cold and calculating in totting up his cushy number.
He will be furious with himself that he underestimated your self respect.
This isn't about you, this is all about him and what works for him.
I have friends with younger sisters and they have so many stories about men that were so suiting themselves for years out of their comfort in homes they didn't own.
He wasn't good enough for you, and you know it.
You know you deserve better.
Yes it is hurting you now, but time and distance will bring such relief at another decade not being wasted.
Teens, even the great ones can be tricky.
He is not going to walk into a situation when any woman with even a smidgen of grey matter is going to want to be burdened with 3 feral teens she didn't birth, believe me.
Certainly not long term.
Please get his stuff out of yours asap, evdn pay for a van, but get it out.
I suspect he will try to drag this out this week, not collect the beds, and will try and bring those prepped penitent children to your house, as soon as he can.
Best ignore the messages completely and watch the trajectory.