best friend is makeing the wrong desition

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i have a best friend that is married and has kids. she lives next door to me. recently she was reunited with the man that she used to have feelings for and a friend came back to ct. her friend that just moved back here is going to live with the man that she used to date back in high school. she thaught her feelings for him where gone because she is married. when she saw him for the first time in years the rekindle flamed back up. now she only thinks about him and not her husband and kids. i tried to tell her to let it go and just be friends with him. she can not let it just be friends. this man is also married. i do not know if he has any kids or not. tonight that man and his wife showed up at her house. that man and his wife showed up in two diffrent vehicals. my best friends husband came over to my house tonight and told me that his wife left with that man. i could not look her husband in the eyse because i know what is going on and i do not want to be the one to tell him that she is going to cheat on you. i do not know what to do if her husband askes me what is going on with those two. her husband does not like that gyue at all. please help. what can i do to make her realise what she is doing is wrong. she has it in her head that she is only going to talk to him and that when his wife goes away for work in may he is going to rent a room and she is going to go to that room and talk to him some more. i am a single mom and i know how hard it is raiseing kids on your own and i do not wish that on anyone. she continues doing what she is doing her husband will find out and i do not want to be in the middle. i asked her what would she do if her husband or someone that they both know saw her van at the hotel. she told me that she will cross that when it happens. that is what i am trying to prevent from happening. i do not want to lose her as a friend and i do not want her to mess up her marriage either. granted her marriage is not the best but then agian whose is. at least he doese not beat on her like mine did to me. i do not know what to do anymore. please help me to help her.