My last relationship was a total clusterfuck of psycho breakup reactions on both sides. We were on/off for 3 years and it was just the most ridiculous, unhealthy cycle. I've probably done almost everything stereotypically psycho thing you can do post-breakup, or had it done to me. In no particular order:

• I used to be the WORST at drunk calling/texting him. Sometimes, I'd make my drunk friends call him for me from their phones.
• We both would invent excuses and reasons to continue to talk/run into each other.
• He would make fake Tinder and OKC profiles to see if I was on them...and if he found me on one, he'd call or text me to tell me what a lying slut I was.
• There were multiple post-breakup text conversations where we bitched each other out and blamed each other for everything under the sun.
• I had an STI scare after one breakup and called him up hysterically, insisting he tell me who he cheated with.
• We both, on multiple occasions, sent regretful emails post-breakups filled with the most hyperbolic emotion.
• He kept tabs on my Facebook photos via mutual friends and would email me with screencaps whenever I wore something "too revealing".
• He didn't like confrontation so he would text break up with me - as in, he'd driving OUT OF THE STATE and text me we were over. So whenever we were on an "off" cycle, I'd drive by his house to see if he'd left the state yet.
• He also did drive-bys - once, I had a guy over one night when we were broken up. Conveniently, 10 minutes after the guy parked at my place and came up, my phone started blowing up with suicide threats so I'd leave the date and go over to ex's place.
• Again, he didn't like confrontation so all of our breakups were via text/email/a note under my door (SERIOUSLY). After the first zillion breakups, I never believed him so I'd show up at his house and use my key if he wasn't home. I was so acclimated to this behavior, I thought it was normal - extreme break up text, big sigh from me, go over and let myself in, talk the problem out, not actually break up.

....sadly, there's probably more that I've forgotten. We broke up for good almost two years ago. Life is much happier and more stable these days.