Repost: My best friend cheated on her boyfriend, who is also my friend; what should i do?

get one of the guys who flirts with her, or better yet...the guy who made out with her, to tell austin what's going on. if that isn't possible, then you have to find a way to catch ashley in the act. you need proof before you go to austin. try setting up a hidden camera in your room for when ashley's talking to you about what she's doing with other guys. also, try getting her on camera in a group setting, so austin can see how she acts when he's not around. then be very sensitive about the way you tell austin. you don't want to ruin your friendship with him by being too harsh.