“I sat there in disbelief for 15 minutes before I went home, packed up the kids, and went to a hotel.”

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Some responses are also from this Reddit thread.

"Turns out they had been meeting in hotels and getting drunk most nights for over a year! Many days, he would come home, start an argument with me, and then leave to see her! They had plans to replace me and move her into the house, etc., but she was so unstable, he broke up with her about a month before the said incident. She was very angry at being discarded, so she contacted me to spill the beans. Good riddance to both."

"I decided to go for the metaphorical jugular. I went and found her dad. He burst in the door, saw exactly what I did, and lost his shit. My then-ex-boyfriend got a hit to the head and was literally thrown out in his underwear. The party was over after that, everyone had to leave, she wasn't allowed to see him anymore and wasn't allowed to go to parties for months afterwards.

I dumped him the next day (he'd taken off after being thrown out), and of course, he blamed me for the trouble he was in because I told her dad, who got hold of his conservative Christian mother, who grounded him too.

I was on cloud nine knowing I'd caused both of them so much misery."

"I decided to keep the sex going with her. I proposed to her, and the next thing I knew, we were engaged. She moved in with me, and after graduating from college, had some job interviews. After one of the interviews, I caught her texting some guy a lot, and she accidentally left her messenger app open at the time on her computer, where I could clearly see them chatting about a sexual experience they had and how they were planning another. I broke off the engagement, kicked her out of my house, where she ran to that guy's place and started living with him.

I later found out that it didn’t last long. She eventually cheated on him again and got married to someone else with money. That didn’t last long as she cheated on him, too. So I guess once a cheater, always a cheater."

"When she eventually called to break things off, she claimed I 'didn't fight for her,' which was confusing because I had supported her completely. I later found out she’d been seeing the other guy for a month. He’d been in her ear the whole time, feeding her the idea that I was no good, despite my never having an issue with him."

"I walk in and hear the bed springs squeaking. The night before, I was calm and kind of laughed about how ridiculous it was. Day two...not so much. That woman stayed in my bed for three hours while my husband and I argued and I broke everything I could get my hands on."

"I read it out loud and heard the shower stop. She came out crying and apologizing. I told her to get dressed, threw her stuff in my car, and then drove her to her parents. Her mother asked what was going on, and I explained it to her. She told me I'm more welcome in her house than her daughter, but I just left."

Responses have been edited for length/clarity.