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The original was posted on /r/aitah by /u/placidbeans on 2023-09-20 15:06:39.

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I (19M) recently found out that my best friend (19M) has been fucking my ex for two years and has been lying to and gaslighting me about it.

For context this ex was someone I dated for 2 years and our relationship ended very badly, a lot of drama and fights, after we broke up she went to a lot of my friends and essentially said that she’d have sex with them if they promised to stop talking to me, lost a lot of friends but I wouldn’t want them anyway.

When I found out about her antics one of the people I confided in was my best friend, I asked him if she had approached him and he promised me she hadn’t and if she did he’d say no, about two weeks later and I see them both walking out of some bushes where we frequently go to smoke bongs, I ask him what happened and he promises that they were just sharing some grog and nothing happened.

Cut to about a month later and while at a sesh where I was wasted and couldn’t even think properly he pulls me aside and said they did have sex but he felt extremely guilty about it and he promises me it’s never gonna happen again, I forgive him because it was his first time and I really just felt bad for him and wasn’t thinking straight.

Cut to 2 years after that and me and my ex decide to hang out just to sort stuff out when she tells me that her and friend have been consistently fucking for past two years. I find out that he had even lied to me about an emergency with his sister to get my dad to pick him up from about 20 mins out of town to drop him off where he was actually going to see her. It’s been about 6 months that I haven’t talked to him now and I’m getting a lot of pressure from our friend group to forgive him. It’s so out of character for him and we grew up together, he’s been my best friend for as long as I’ve known but I just can’t even look at him the same anymore, and tbh I want to just move on with my life and cut him off for good.