I know of a story from my workplace. It happened to a guy many knew; decent fellow. He fell in love, went against his mother whom never liked the girlfriend and it got to the point the girl made him rob a store, steal drugs and punch a homeless guy a couple times. She was the mastermind (the manipulator) and he was just following through, saying yes to everything.
Then after serving his 3 year sentence (prior to that he never got in trouble with the law ever), he found out he's not the father of their 6 year-old son, she cheated the whole time, she tried to falsely accused another man of sexual assault (by hitting herself and ripping her clothes; luckily it didn't work), she only mimics emotions and other things. She admitted to using people since she was a kid and never feeling any guilt nor remorse; a pure psychopath.
Even though he started out as a normal, gentleman... how on earth did he not notice the red flags? How can a woman have that much power over the man... enough to literally make him break the law?