I am sorry. Was he actually diagnosed with OCD or it’s a self diagnosis . He needs proper diagnosis. My husband has severe OCD but he is a great husband and productive member of society. He does have to be on low dose meds, he has to finally do it as being off meds was making his life hard. Now your partner has to take charge of his health. He isn’t a child and you can’t be the one guiding it. He has to take charge

Having said that if you don’t want to be with him you have rights to end it. You don’t need to throw him out today. He could be given time to get his act together. But there is no reason for people to stay in a relationship if they don’t want to be or if the person isn’t right for them. Life is too short