"When I caught them, I kicked in the door to his house, pulled him off of my girlfriend, put him against the wall, and proceeded to beat him up."

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"LOL! I told her, 'Enjoy your new life.'"

"But that wasn’t the half of it. About a day or two later, I had to return to the house to pick up some things. My wife wasn’t there, but while I was in our closet, I noticed a strange looking bottle of medication on the shelf. It was from a pharmacy we never used and a doctor I'd never heard of before. 

Naturally, I looked up both the doctor and the medication, and I was instantly horrified! The doctor worked performing abortions, and the medication was one that was only prescribed after that procedure. My wife and I had not had sex in many months at that point, so not only had she had sex with yet another man (never found out who), but she'd gotten pregnant and had an abortion. I filed for divorce the following week."

My girlfriend didn't have anywhere to go (a recurring problem with that one), so I wound up staying with her for another six months before she finally left."

"Beating someone up really doesn't make you feel any better, because at the end of the day, it's the person you won't put your hands on that betrayed you, not the douche sleeping with them."

"She became very depressed immediately afterwards. I really tried to salvage that marriage — we went to therapy, and I stuck with her through a couple of nervous breakdowns and hospitalizations. We tried to rebuild the trust. 

Four years later, I caught her having an affair, and she is now my ex-wife."

"At that point, I was just done with her BS any way, and said 'you two deserve each other.'"

"She didn't say a word as she walked out with her head down. 

Now she has a boyfriend who pisses the bed all the time. Looks like I got the last laugh! The only gold she'll ever get is golden showers."

"It messed me up pretty good, and for a long time."

"I kicked him out two weeks later with 10 days' notice to find a new place for his sorry ass."

"After this whole ordeal, I took two years off and traveled the US, trying to find myself. 

I moved back home and found out she lives with him now. And his mom. And his sister. And his sister's five babies from four different fathers."

Note: Some responses have been edited for length and/or clarity.