Obviously this is in my experance so based on people I know not on anything else,
Ime men and women tend to part company for very different reasons,men tend to do so because they cannot cope with family life or their heads have been turned,
Women tend to because something is so wrong in the relationship its either emotionally or physically abusive situation for the children and/ or themselves.
People who just fall out of love and go their separate ways don't tend to have the nastiness after doing so.
Someone who is abusive is always going to think any action by the other parent to protect the children or themselves is a travesty and them being a cunt.
Someone who chooses to leave for another person will rarely have their children at the front of there mind,
And someone who has been left for another person may act out at first yes unacceptabley but still understandable Ime the leaver tends to not understand this and goes in like a bull in a china shop pushing ect then it gets nasty,
Obviously there are people who for what ever reason never get past the you cheated you bastard phase but Ime its a minority unless the other party try's to elevate the OW/OM to high to quick in the children's life with little regard for how they feel.
The thing to concider is people with happy great relationships don't just randomly just split up