I made my ex insane and now I'm scared

Hi, so I dated this guy when I was 15, for almost 4 years. We ended all communication when I was 20. We're the same age (21). He was my first and it was a terrible relationship. He had trust issues, anger issues, kind of a bad boy. I had trust issues too but I never really mentioned them. I was a bad girlfriend. I cheated here and there, he'd always find out, break things, wait at my window at night and come apologize. He hurt a lot of other guys, he loved fighting. He's really big, muscular, tattoos very VERY intimidating. Girls wanted him guys wanted me, it was constant fighting, I'd always leave him.

He did get very rough with me quite a few times, threw glass, shoved me. We both emotionally abused each other, I put him down any chance I got and he was never honest with me. Called each other every name. So I had found another guy I was interested in, parked in my car with him in it to talk, my boyfriend found us and smashed my window and choked the guy. I ended up choosing this guy over my boyfriend and he obviously didn't take it well. Fast forward I'm with this new guy about a year and a half, he never hurt me, he never got angry. I really did love him. But of course your first stays on your mind. I get done with the new guy, break up, and then my ex gets into contact with me.

He threatens my current bf (now ex) to me. I don't know what the current guy did but I didn't want a part of the drama. So he goes on and on but wants to meet up to talk. I agree and he picks me up, we drive around. Here's where the real crazy starts: he drives like a maniac, he tells me that some place I won't mention taught him to 'not care anymore' he does whatever he wants, told me he steals whatever he wants, tells me his thoughts on aliens, religion, weapons, gangs, love. He says he partied with celebrities in such and such places. He says he knows all about the underground world and he's unlocked the secrets to life and that he hangs with millionaires and billionaires. He says yes I experimented with drugs but I'm clean now. It didn't seem like it. I came right out and said you got weird.. and he acts surprised. He says his dad told him that too but he thinks he's just 'matured'. He told me all these things in a matter of minutes. Meaning every sentence was a new subject, one entirely different and weirder than the last. I started to shake, I was very scared. Too scared to tell him to take me home.

I look down and just nod to most things he's saying, if I started to talk he immediately interrupted to tell me something else he believed. He said if anyone found out what his last name means that they would stalk him. He says he's been keeping tabs on my current ex and that people report back to him whatever the current ex does. He lies about a lot. At first I thought, alright, joke's over, you're trying to scare me to get back at me and it worked, okay. But when he genuinely did not think he was weird and nothing at all was wrong, it scared me even more. He started to say I love you. A lot. I said do you think that's really appropriate? And he said I never stopped loving you, you complete me, I'm so happy now. He did say he has OCD. I know I need to cut off all ties now, I really didn't know he got this bad, but I'm worried if I blow him off or block him he'll really go after my ex. He says he has plans. I'm scared I don't want to make any scene, I'm a good, quiet girl. I stay away from drama. I thanked God that night that I am as level headed as I am, because people are so much worse. I've encountered crazy people, nothing ever like this. What is there to do?

You didn't make him insane. This is his own problem. And I would suggest talking to your local police about it. He's scared you and made threats against your ex, both of those are bad. The police might follow up directly with him or just log his threats in case things escalate. Either way, it's giving him perspective on what he's said. No sensible person would continue threats or actually do anything when they know the police are already involved. And if he's not able to be sensible, the quicker he can get some help, the better.

You could also consider contacting his dad, since I'd guess you know his family reasonably well? And bring up your concerns with him. It seems like his dad is worried too and this might be an extra push for him to encourage his son to get some professional help. But I'd start with the police.