I'll go first. My ex cheated on me with a dude, (I'm les, she's bi,) brought home chlamydia and bed bugs, then after 13 years of no contact, texts me randomly to try and pull me into an MLM pyramid scheme.
These are interesting to me, I never got a chance to experience this stuff myself. I have only 1 ex and it was from a relatively short relationship in high school, I got married to the second girl I ever dated and we're still married decades later.
That first girl did cheat on me, so that sucked, but we never spoke again and I have no idea where she even is at this point.