Long-time lurker, first-time poster here!
Basic summary: I dated a guy who lied about being in the Navy told everyone I was dead and tried to stab my mom.
Detailed event: I had been in an abusive relationship with him for four or five months. I was 16 at the time when I met my ex. He was significantly older than I was, and a proud member of the navy (or so I believed.) Well, I was homeschooled, going into my senior year that fall. I had participated in some community activities (which I eventually dropped due to his request.) and overall was a pretty happy person. The first few months were fine, typical relationship filled with infatuation. He would go out every Wednesday to drink with his Navy friends (who I had never met) and he had his own apartment about thirty minutes away (Which I had never been to.)
About the third month into our relationship, he asked me to stop going to my painting classes hosted by our community due to one of the instructors being a long time enemy of his. I listened to his request and figured, sure, why not. (Naive 16 year old me regrets this.) Around this time, he became distant and abusive, like actually physically abusive. He'd shake me, he busted my lip one time, he had threatened my family if I had ever told anyone that he hit me. He would always run back and cry after each mess but towards the end of our relationship, I knew that I had to let him go. A few days later I became very sick. I was vomiting, I couldn't go anywhere or keep anything down. It turns out I had several cysts on my ovaries that ruptured, and I had an infection because of this so I stayed in the hospital for a good two weeks. During the beginning of my stay, I was still talking to him, things were actually pretty okay so I considered staying with him. (This was also my first real relationship, and I was a dumb little shit.)
The first week I was in there, his mother (whom I had only met once before) had brought me flowers on a Wednesday. I had asked if my ex was planning on visiting me that day after he was done hanging out with his Navy friends. She told me she wasn't sure which friend of his was in the navy, but she said "I'm sure he'll stop by soon." and left super quickly. Her statement confused me. He came by about two hours later and I told him what his mother said and he lost it. He knocked over the flowers she brought in, threw my food and stuff on the floor. He literally threw a fit with me and said I upset his mother. He was screaming at me, one of the male nurses made him leave which made him even angrier. I texted him a general breakup, blocked his number and shut off my phone. Not even two days later, I had former friends/ acquaintances commenting on my FB wall different variations of "So sad, RIP". My mom freaked out. She ran into my hospital room as soon as she got back, and woke me up. I hadn't really been on facebook or my phone since I had been in the hospital because I was heavily sedated due to the pain and know I would be getting a ton of calls from my ex. She showed me the messages, she logged into my account to inform everyone that I was still very much alive. She had parents of my friends call her and check on her too. She had to explain that I wasn't dead. The next day, I got a text from someone who posted a "RIP" variation on my wall, I asked her who told her I was dead and she said my exes name. Then, about a week after that I had gotten a message from the assistant instructor of the art class I had used to go to, he said his girlfriend used to be in a relationship with my ex and he was abusive to her as well. He had heard about my fake death, and he actually gave me his girlfriends number. I got to talking to her and she sent me messages of my ex trying to reconcile with her while we were still dating, well before I went into the hospital. I asked her about his Navy friends and about his Navy experience and she told me as far as she knew, he still went to therapy every Wednesday. He was never in the Navy. He was a high school dropout who tried to kill their dog after she broke up with him. I found out he still lived at home with his mom, apparently he was cheating on me as well. After I was discharged, he showed up at my house and apologized. I told him to leave, and of course, a fight breaks out and he literally pulled me by my hair and dragged me around my yard. My mom came out and tried to fight him off but he pulled out a knife and started swinging more and trying to stab both of us. My mom picked me up and we ran into the house and locked the doors. Of course, we call the cops and he's gone by the time they get there. Eventually, we moved away. Years later, after I forget about it all I bump into him at a Walmart and he smiles and waves at me like we're old pals.
Not sure if this is what OP was looking for or not, but I genuinely believe he is a psychopath.