OP- I understand your anxiety. I didn't have any at the time it happened to me, but I should have done. Thank goodness that DH was honourable in all respects:
My DH was NOT the cheater in the marriage - and I met him almost 12 months after he had left. However, the ex continued to be manipulative regarding the children.
I felt for her when her 'newly found' father was terminally ill. (She had told my DH she was an orphan when they met, so nothing added up to him. They had been married 16 years.) But that was when she stepped up the pressure. My DH fell for it!
He drove her to a hospital to visit (in my car), he drove back to look after the 3 DCs, he collected her from the hospital and drove her back home. (This was a 100 mile round-trip each time and he was doing it twice a day). My DH was never allowed to visit the hospital ward where this newly-found father was.
But DH honoured his responsibilities and left our family home and moved in with his children temporarily. He had to use Annual Leave to mind his 3 DCs because of the distance. Although the 3 children used to visit us regularly, ex-wife said that they would be confused and upset to leave their permanent home under such upsetting circumstances.
DH and ex-wife attended the funeral together - and DH asked me to agree to using £48 towards flowers, announcements etc (this was 1979/80 when £164 per month was a teacher's salary). DH didn't recognise anyone at the funeral (this was a supposed 'long lost family' so appeared possible)
But then the ex-wife arrived back home unexpectedly one night and tried to climb into DH's sleeping bag on the lounge floor - with words of 'we were always meant to be together'. DH rejected the overtures but brought the 3 children to our family home the next morning. It was a 'jolly holiday' in the children's eyes - but safety for the children in reality.
We were given full custody of the 7 year old (is that called Resident Parent now?), and 50/50 of the 12 and 14 yr olds.
Women CAN be cheaters and manipulate:
- there was no 'long-lost father'
- Ex-wife was staying with a 'long-lost aunt' for a 2 week break from DCs
- whose funeral did my DH attend?
- She picked up a boyfriend whilst there who drove her back to the family home when she had 'had enough'.