He and my brother work full-time for the same company. My ex always knew that my brother didn't like him very much. My brother treated him decently when we were together but he never made more effort than that because he dislikes him. Today exceptionally, my ex and my brother ran into each other and my ex greeted him. My brother replied with an unfriendly ''Hi''. Why did my ex bother? They were never friends to begin with and I sure didn't make any move to stay friends with my ex!
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He was just being cordial.