If LW2 actually has OCD & doesn't just mean they are fastidious, I think there is probably more to get into than just the cleanliness of the apartment (or like, probably it's an issue, but the OCD stuff is tangential to that; definitely a big part of the dynamic is probably that fiance knows that if he doesn't do something, LW will feel compelled to).
Basically, if they don't split bc they're incompatible, there should be some effort to separate 'these are our standard chores and cleanliness requirements' from 'thisnis LW's OCD pushing them to clean and check that everything is clean and realize that 5 more things must be clean'. And LW needs a partner who will do his housework unprompted & on some kind of predictable schedule rather than passively relying on LW's OCD (also, big challenge for LW even with a better partner will be LETTING THEM DO IT & sitting with the discomfort of needing to do those chores, which is why imo they need to find someone they can actually trust will do their part.)
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Basically, if they don't split bc they're incompatible, there should be some effort to separate 'these are our standard chores and cleanliness requirements' from 'thisnis LW's OCD pushing them to clean and check that everything is clean and realize that 5 more things must be clean'. And LW needs a partner who will do his housework unprompted & on some kind of predictable schedule rather than passively relying on LW's OCD (also, big challenge for LW even with a better partner will be LETTING THEM DO IT & sitting with the discomfort of needing to do those chores, which is why imo they need to find someone they can actually trust will do their part.)