Abel✯lied's Favorite

So like is anybody familiar with an omegaverse story where the relationship of a pair is falling apart and the omega is actually in pain everytime his pair sleeps with other people like he actually feels and knows it whenever his pair is being unfaithful??? Idk y i suddenly remembered that but pls help me find it. I cant remember the title nor the author ㅠㅠ i cant even remember if it's a oneshot or a story inserted somewhere in a manga pls help