where it centralized from;
— good chemistry, sparks, sexual tension
— good character development
— non feminine, non tsundere, one dimensional or stockholm syndrome uke
— shounen ai (or if it can't be helped no plotless smut where every chapters they have smegs)
— interesting, convincing plot (not clichè, no slice of life, no university, no police/detective/gangster trope, no concubine or sex worker trope, no arranged marriage trope, no omegaverse, no horror)
— yes to sanpaku eyes ml, playful or teasing ml, condescending ml but not to the point he hurts the mc or anyone around him, i only accept if it's a bl with actual psychological tag or ml have a diagnosed mental illness (same for mc)
— non toxic ml, non rude/cold ml, realistic and calculative ml
— i'm open for bl subtext/bromance outside of bl category, any genres except slice of life and horror (can be josei, shoujo, shounen or action-fantasy tag)

I can offer a few BL stories that deal with unfaithfulness or infidelity, albeit they might not really fit the requirements you requested.

Chai Ji Dan's "Addicted": The love affair between Gu Hai and Bai Luo Yin, two high school boys, is the subject of this book. Although they are very much in love, the two must deal with problems like infidelity and adultery.

From Bittersweet comes "Sotus: The Series" The narrative of Kongpop and Arthit, who are both engineering students, is followed in this Thai BL series. As the story progresses, Kongpop develops jealousy over Arthit's close friendship with a different student, which results in some adultery and cheating.

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