My friend is dating my ex

[qaloss]

Well, I will say that good friends at least ask before it becomes anything. I think he's out for ass and nothing else. You may have told him a bunch of "good" stories about her in the sack and he wants to find out for himself. I would lose both of them. There are better things to worry about in life.

[Knoxy]

Maybe it was this sort of thing that you needed to get over her. Look at it for what it is and ask yourself if this is really the kind of girl you'd want to be with?
P.S. problems always come up when relationships happen in three's. Someone always has to be the bad guy and it sounds like you're it. I'd get out as soon as possible.

[The_Grinder]

I heard the Miller Light dudes past a man law that friends' ex's are off limits. But the amended it so if the girl is really hot, they only have to wait 6 months. So if this girl is hot, it looks like she is fair game.

On a serious note though. I think if you met this guy at the same time as your ex, and he was her friend as well, then I dont think he's doing anything wrong. If he is your long time buddy of 5 years, then yeah, thats bullshit. But just being friends with him 6 months, when he was just as close to your ex, I dont think he needs to ask permission. Obviously its your choice whether or not to hang out with him, but I don't think he "betrayed" you or anything.