This works too, but it's overkill for this situation. You dont need to bring out the big guns for one little thing like this.
I am not sure I would consider being unfaithful 'one little thing'.
If your GF got drunk and let some random fuck her, would you consider that a 'little thing'? Is that trivial to you?
A person with a genuine conscience would have a hard time compartmentalizing something like this if they never came clean with it.
You make a decision to lie and conceal every day. So today this guy just cheated on his gf. But tomorrow he did that
and lied and concealed. And the day after he will have lied and concealed
again.
The conscience can have a ruinous impact on some. Some people are fortunate enough to have little or no conscience. But for those that have them-
Do not fuck with them, or they will fuck with you
I had a friend on my wrestling team in HS completely go off the rails after he graduated. He was an honor role student, bright as hell, very switched on. But he got into drugs, dropped out of JUCO, gained almost 100 lbs in 2 years.
I saw him almost unrecognizable late one night collapsed outside a bar a sweaty, drunken, miserable mess. I pulled him up and after he finally put together who I was, I took him to the 'Awful Waffle' for a meal and a coffee.
Looking at him, I started to actually feel anger, and I just looked right at him and asked, 'WTF happened to you dude. Something had to happen to you for you to end up like this.'
He started shaking his head like he didn't know, and I called bullshit, and just told him to tell me what it was.
Turns out that before he graduated, this dude was fucking his little brothers girlfriend for like 4 months. He never told his brother. His brother never found out. And his brother was still dating the chick.
The guilt had literally eaten the dude alive. I said that we should go tell him. Right now. He just shook his head, started crying, and ran off.
I happened to know his little brother, who was on my old HS wrestling team. I dropped in on a practice and asked him how his brother was doing. The guy just immediately looked down all sad and said he was really not doing well at all, no one seems to be able to get through to him. I asked him if he wanted to know why that was? he said Yes. I said are you sure- he said yes. Then I just flat out told him that it was because his bro was fucking his GF for 4 months after they first started dating, he's guilt wracked over it, but he's too scared to tell you.
A few days later, little bro confronted his big bro, finally got it out of him, gave him the ass beating he needed to put it behind him, and dumped his GF.
It took a little while, but once the cat got out of the bag, my boy slowly became something approximating his normal self. If it had not gotten out though, I'm certain he would have died.