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The original was posted on /r/AmItheAsshole by /u/Lost-Ad-5392 on 2023-09-06 20:14:33.

My Younger Brother, early 20s, and his now Ex Gf were on a break from each other for a few months now. The reasoning for this break between them from what I heard is because my Brother wanted to try the single life for a bit, and they were both not gonna date or talk to anyone during this break.

However my brother took this break and went to see other people. A few dates from what I heard, but the icing on the cake was that he was planning to move in with this girl that he never met in person. Even trying to convince us that this girl is amazing and great. I’m certain this would have happened if not for the fact that this Mystery girl ended up ghosting him.

Now me and his Ex are friends, and hearing all of this left a bad taste in my mouth. She was waiting for him to come back, giving him till December. She stayed faithful to him the whole time. So I told her what he has been up too. She is a good girl, and doesn’t deserve to be lied to and oblivious to his actions.

This ended up with her calling and Yelling at him, and essentially caused this bridge to burn between them, and fires going up between him and my family. With the Ex and parents trying to put them out.

So AITA for telling my Brother’s Ex about his lying?