Well...it is tough to be apart from yr own children. Although, mentally you tell yrself that it is best for the child. As having them to be with their father, they wld be financially strong and well taken care either by maid or grandparents. But one thing for sure bond between mom and child will never break.
Ensure that in separation, you state that you get to see the child every weekend. That what i do with my children..Custody goes my hubby but Law permit me to see them every Sun 8am-8pm. So the relationship will never end. As the child grow up, they will know who is good mom or who is good father. Thus they will also know who can they relay to when they have growing up problems.
Once my child goes to Sec school, after sch activities they come back to my house and return back to their dad house before night fall. The father cant say anything as it is children who come in their free will. That the achievement i feel.
Again this is my suggestion.