i once lived with a girlfriend that had ocd it got so bad it was crippling we couldnt leave the apartment without her insisting on turning around and going back to check if she locked the door turned of the stove etc i attended a few counseling sessions with her and we came up with a way to help deal with the situation she would lean on my certainty in order to make herself feel better i would lock the door and i would check things when she asked to go back and check i would tell her i checked and i was certain that helped when we were together but it did nothing when she was alone such a complicated disorder i wish it upon no one