First of all, your childrens reaction is completely normal and completely understandable.
So try not to worry about how this will impact their future.
Instead, just focus on now (kids live in the moment, anyway).
As for their fits, stay reassuring, understanding, and as patient as possible.
Age-appropriate limits that are consistently enforced make them feel secure and grounded and help them know what to expect.
When they act out,disciplineas necessary but calmly as a way of correcting behavior, not criticizing it.
Reassure them that Daddy feels the same way, even though you don’t live with him anymore.
so they know it wasnt their fault that you were upset.
Read to them, too.
Look for picture books that talk about parents who don’t live together.
Let them know it’s okay to be angry and sad.
Encourage (very basic) role-playing for your older child, so he can work out his feelings.
(A quick Mom demonstration might even make your wee ones giggle.)
Don’t have that many routines?
They may also sense the tension between you and their dad, and that’s unsettling to them too.
Both of you should make a concerted effort to avoid talking about the other in disparaging ways.