I've been debating whether or not to post some of the clearly psychopathic behaviors of my ex...not just the abusive ones. (For those not in the know - not all abusers are psychopaths but all psychopaths are abusive. Studies also seems to suggest a much higher prevalence of psychopathy among those who abuse. Not really all that surprising, I guess.

)
I will, just a handful,
only to illustrate you well and truly just cannot anticipate what a psychopath is capable of. This is just a small list off the top of my head.
My ex had the woman he was having an affair with pose as a guy to befriend me online. Over the course of several months I began to confide in whom I thought was a friend. Once I told 'him' how unhappy I was in my marriage my ex magically appeared with printouts of every single conversation I'd had, accusing me of being unfaithful and cheating on him. The printouts were redacted to 'engineer' damning evidence...or rather, misconstrue anything that even reasonably could be.
Stole my mother's wedding ring from the biomedical bag the hospital returned it in following her death.
Stole $5,000 from my father while he was in extremely poor health. My father passed away two weeks after this and I paid the estate back through my inheritance.
Secretly opened an account I could not access in order to move my inheritance from our joint account to only his.
Attempted suicide in front of his 12 year old daughter after calling me,
in front of her, to tell me I could explain to her how it was my fault her daddy was dead.
Told my 14 year old niece he would never have raped her had I not left the marriage. Then denied ever doing it at all, or saying that, then plead guilty to avoid a longer sentence.
Told his family, with such conviction, how horrible I was they ultimately believed him and became proxies in intimidation, cyber stalking, and abusive behaviors. My teenage nieces, who were online friends, would apprise my ex of every blog post, photo, and update only friends could see. My ex-MIL sent my ex, by this time in prison, a picture of my house in England from google earth. My ex sent me a birthday card with a hand drawn rendition on my house on the front.
My ex didn't so much as wish me a happy birthday for our first seven years together - yet at a surprise party thrown by my sister years later he gave me a diamond necklace. Gotta keep up appearances, donthcha know.
Stole our son's video games and console so our son would prefer to spend time with his dad - yet he made it very clear he had no use for our daughter. Even now, he sends cards and letters to our son but misses our daughter's birthday every single year.
---------------------------------------------------------
After all this I can only add there is no preparation in life for a psychopath. They don't come with a warning label and at first appear to be perfect beyond measure. I didn't know anything was really wrong until I was so deeply trapped in the relationship I couldn't leave easily.
Post-abuse, post-relationship...I have to monitor communications between ex and kiddos after several abusive and threatening letters to them. I personally maintain a very strict no contact with ex and ex-MIL. I educate munchkins about their's father's behaviors that are unacceptable and why. And kiddos have been coached about what they can't tell their grandmother, because she will tell their father, and he will use it against us somehow. It isn't ideal - but no contact and ensuring my privacy (which stems against how much the psychopath can use to hurt you) is really the only way I've found of 'coping'.