the definition of obsession: is a persistent disturbing preoccupation with an often unreasonable idea or feeling. so, yes, that's a bad thing. ever see or hear of fatal attraction sometimes people get so attached that they can't even function without knowing exactly what their significant other is doing. the paranoia--that he may not like you, or he may be checking someone else out. the constant need of reassurances. that unbalanced fixation is oppressive and will eventually lead to a break up. obsessions in relationships shouldn't be confused with passion and they are not sweet or nice or healthy. definitely rethink this one.