Have you ever had a bad gut feeling about a (generally well-liked) person that ended up being totally justified? If so, what happened?

My ex. I had weird feeling from the start, because they wanted to spent time with me 24/7. my ex was so superkind, helpful and always giving me compliments and i quess i got hooked on that cause they felt different being overly nice. I will not share whole the story, but when i was with them, i started to notice patterns. So shortly my ex sexually abused/raped when i was sleeping, this happened atleast 3 times. And their excuse was sorry, thought you were sleeping. They were pressing to do other stuff too, i quess you can probably quess, but if i declined i got silent treatments and they were moody and annoyed. When my ex was pressuring to do videos on Pornhub(i declined ofc) i started realise that this is so fuckin sick, i started to have insomnia, depression, getting angry and started to have social anxety. Relationship ended when i discovered that they were cheating +6months with their friend without protection ofc, and all their excuses were blaming me for being moody, angry and suicidal, yeah after all that i think not many women will be sane. They werent sorry or take accountability. I wasted 10 years because i was too stupid to realise that that wasnt love. I still feel like a idiot. Therapy has been huge help for me and i know that it will take years to recover. I shouldve listened that gut feeling because i ended be in relationship with a sosiopath or something similar.