Is AUTHOR wrong in the post ? POST : This story can go on for fuckin hours but I'll shortin it. 

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My friend (25F) lets call her M and her boyfriend (27M) lets call him D, have been dating on and off for one year. M has a child and has always been hung up on one of our mutual friends (M 28) lets call him S, and has cheated on D 3 times with S. M told D about her last time cheating and she even told him that she does not see a future together but does love him. He stupidly decided to stay and work it out. 

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All of that happened about 2 months ago. M talks shit on her own boyfriend D, every single day. Saying how they haven't had sex in months, how she wants Mike, how he annoys her, how there is no spark. D on the other hand is for some reason head over heels for her and refuses to back down and give up on her. 

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I had a party this past weekend and all 3 of them showed up, and it was so sad to watch. M was all over and S and D just stood there lonely. So I called M to tell her to end it with him because it is getting hard to watch and not tell him that she doesn't want him anymore. He is my friend too and its really difficult not to tell him everything that is happening. M told me they are going out of town this weekend to see his parents, so she will break up with him after that so she can get a free trip out of it??!!

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I told her she is crazy and should break up with him now so he can be with his parents this weekend instead of be alone when they leave ( They live on the opposite side of the country so he only sees his family twice a year). I told her it is cruel what she is doing and isn't fair. He is going to need his family when she breaks his heart and she just looks at it as a ticket out of town for the weekend and all meals and drinks paid for. 

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AITA for telling her to leave him now? She think's I am in the wrong but I am trying to be there for both people without picking sides. 

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TLDR: friend is not happy with boyfriend and is waiting to break up with him till after he takes her out of town this weekend. 