From personal experience, if such a man manages to find a vulnerable woman at exactly the right time, he can get her to believe anything. The man I fell for only had 2 children he didn't see because his "psycho ex kept them from him" and he "couldn't afford to take her to court". I sympathised and agreed with him and that I thought he was wonderful and didn't deserve what she had put him through.
At the time it was just me and two small kids. I was having a hard time adjusting to parenthood and had mental health problems.
Over the course of a year, I did come to see the truth it. I had previously worked within the legal profession and knew plenty of family lawyers who would have been happy to have given him a pro bono consultation. I even offered to pay for him to go to court. At first he was keen, but then kept making excuse after excuse, and I couldn't understand why he wasn't taking this opportunity to get to see his kids.
But, like a muppet, I continued seeing him.
He was gorgeous and he was nice to my kids, and I was surprised he was interested in me at all.
Other things cropped up which seemed off, and then a friend I hadn't seen for a while saw i was seeing him and filled me in on the truth. His ex was not a psycho, she was a thoroughly lovely, normal woman, and he wasn't interested in seeing his kids.
This was about 10 years ago, and I feel so monumentally stupid. Behind every "psychotic" ex is the man who made her that way.
Even my own father managed to bag himself a gorgeous young wife (much younger than me) despite the fact I hardly see him because he's such a twat, and the 2 children from his second marriage have completely disowned him. They've had 2 children together and I don't know what the hell he's done to her, because she's a shell of a woman.
If its any consolation I don't think my dad, or the man I was seeing, are happy. Not truly. I don't think they ever will be. When my dad drunk calls me, he always says that the biggest mistake he ever made was leaving my mum.