Is AUTHOR wrong in the post ? POST : It started awhile back at a youth group weekend me, the "long-time" friend (L) and the "new" friend (N) all attended. Before this weekend I had never met N but we basically ended up having to drive up together with how the carpooling worked out.  We ended up hitting it off really well on the ride. L and N really never interacted apart from maybe a quick sentence here and there that weekend. I didn't think much of it at the time.

The week after, N and I hung out often because we got along really well. At youth group the next week I was social with both and L realized then that an actual friendship had formed between N and me.

As such the next day L took me aside and told me that N had 'wronged' his sister, that it was a very serious thing that really 'damaged' his sister and she did seek therapy. I had only known his sister for around half a year and apparently this was all well before I met her. However, out of respect for his sister's privacy he wouldn't go into any detail about what happened. Just that N was terrible and that I shouldn't associate with him as that is supporting someone who did an 'evil' act and not the victim (the sister).

I told him that I was sorry to hear that all happened but since I was a complete outsider to this incident and didn't know really any of the details that I don't feel comfortable just abandoning N especially when we get along well and I literally have no idea what is going on and would prefer to stay neutral due to that.

Two things of note is that while the sister was somewhat standoffish at times, her and N were many times friendly and would chat at group events and online with each other. I doubt L was lying to me though because I do know that his father was not happy with them interacting due to a 'past incident'. I actually heard the father say this to other adults at church. FTR I don't know the sister's actual feelings on the subject though that to this day they continue to be cordial.

I did make an effort to not hang out with them together due to this. The only time we all would interact was at church or other social events anyone could attend. At those everyone was civil but because I would interact equally with both L wasn't happy. I severely doubt that L's actions were out of jealousy and I do believe that something probably did happen in the past which caused the animosity.

Basically in the end due to this and some other irrelevant issues L and my friendship ended. No big fight or anything but he did feel betrayed. N and I aren't close due to distance and I never asked him what happened due to feeling it wasn't my business.

Still, every now and then I get that nagging feeling that I should have had L's back and trusted him on this instead of putting his feelings aside for a new friend who I really didn't know that well. I don't know if this would have salvaged a friendship but there are times I wonder "what if." So reddit AITA?