#redditstories #askreddit #aita #relationshipbetrayal #cheatingdrama #familyentanglement #emotionalfallout #unexpectedguest  The user recounts the emotional unraveling of their relationship after discovering infidelity. To complicate matters, the ex-partner's younger sibling was living with them during the breakup, creating a tense and uncomfortable home dynamic that blurred the lines between heartbreak, obligation, and unresolved family ties.  redditstories,askreddit,reddit,aita,tifu,cheatingpartner,breakupdrama,relationshipproblems,awkwardliving,exissues,familytension,emotionaltrauma,youngersiblingstay,unfaithfulpartner,livingwithanex,trustissues,heartbreakstory,relationshipfallout,dramaticbreakup,sharedspaceconflict