There's a great thread on Reddit where people confess their past craziness. A few examples:

"Created a fake account on Gmail to talk to him and make him like my alter-ego (started as a joke, ended up as a way to test him). He ended up getting close to her, and said a couple of negative things to her about me, but it was just completely stupid and crazy of me to test him like that. I completely regret everything to do with that. 0/10 would recommend"

"After a week of tripping on mushrooms every other day or so, he tried to break up with me and i told him it wasn't in accordance with the prophecy."

"I hacked into her email account to see if she was cheating on me or talking behind my back (this was a long-distance relationship, and I was having doubts. Though she was actually cheating on me) a couple months beforehand, she had broken up with me because she apparently didn't have time for a relationship. I told her a couple days later I started dating a new girl (totally fake) and about a week later, she was begging for me back. I also blamed the email hacking on my fake girlfriend, and made an email account for the fake GF so 'she' (read: me) could talk to the real GF about me. I might have been a bit crazy looking back on it"

"Got paranoid. Figured out her vm passcode. Listened to a voicemail of a guy telling her that he'll miss her over the weekend and loves her. I confronted her about it and she denied it. I played it for her and suddenly realized it was me from a couple years earlier. She had saved it because it was sweet. AAAAAAAAAAAAAAAAAHHHHHHH"

Ah I love me a good crazy ex story! As long as everyone ends up safe and sound in the end, of course...

Have you ever been the crazy girlfriend (or boyfriend)? Or dated a crazy ex?