Generally, you don't.
Maybe old feelings came back and he realized that he still loved her. And the connection between his EX wife and him may have been stronger.
Answer No.
Yes.
The correct term is "ex-wife," with a hyphen.
yes
no she went back for child abuse
yes
Pay her back of course.
I married my ex-wife after 2 yrs of divorce and i new of her infidelity
Yes, for some ex husbands it is possible for an ex wife to fall in love with her husband or, she may have never stopped loving him.
No. After a divorce, the ex-wife is the ex-wife.
You call your ex-wife in Spanish as 'ex-esposa'. Esposa means wife.