Is OTHER wrong in the post ? POST : I (F, late 20s) have been friends with this guy, let's call him Dick, for 13 years, he's one of my best friends and we regularly hang out as we're both in the same circle of friends. He isn't a bad guy but he clearly has issues when it comes to honesty, especially in romantic relationships. 

Dick is a pathological liar and will always have 2-3 girlfriends at the same time (without them knowing) and cheat on them whenever he can. He's done this for the last 10 years and all of us friends have always known (he tells us all about the horrible things he does), but other than calling him out on it there wasn't much we could do.

We always tried not to get involved by avoiding unnecessary contact with the poor girls. We would see them very occasionally and pretend everything was good. I always tried to avoid those situations because I felt guilty knowing all I knew and seeing them happy with their seemingly perfect boyfriend. I often questioned my morality because if I were in their shoes I would really want someone to tell me the truth. In all these years, very few of them found out what was going on, while the others just got dumped for random made-up reasons.

However, three years ago Dick decided he wanted to hit on a good friend of mine, Jane, who he'd just met a few weeks before. Weirdly, he was fully single at the time, but still I was horrified because I could already picture what would happen. I begged him to change his mind and I warned her and told her all about his past. Told her she would end up cheated on, just like the others before her. But she liked him, and replied "I believe people can change". I knew he wouldn't, but there was nothing I could do at that point. They started dating and I promised Jane that if he ever cheated on her I would tell her immediately, and I let him know too. 

One year went by, and obviously Dick started cheating on Jane with another girl. I forced him to confess to Jane, threatening to tell her myself if he didn't. He confessed, she forgave him. After one month he went back to the other girl. Jane found out, forgave him again. This happened one more time until she FINALLY broke up with him. The whole ordeal lasted approximately one year.

I stayed friends with both. After a few weeks Jane told me something along the lines of "If you really care about me, I can't understand why you didn't cut him out of your life after what he's done to me". She didn't bring that up again, now it's been a few months and she seems ok with me and Dick being friends.

I know he's a toxic person but he has been one of my best friends for more than a decade, we've always been there for each other and even if he's a dickhead with his girlfriends he's a good friend to us. I also believe that being abandoned by his only true friends would make him an even worse person.

At the same time I'm afraid I might have been a bad friend to Jane. So what do you think? AITA?

**TL,DR:**  friend dates one of my girlfriends, repeatedly cheats on her, they break up, I'm still on good terms with him even though he hurt my friend.