You both were obviously brought up very differently. These types of habits don't just happen over night. Infact they are hard to create. Relationships are work. Most of which are choosing your battles and learning how to live with another human who is not you. Sit and think if you can live with this the rest of your life. When they are sick or starting a new job it will get worse. And if you decide to have children all bets are off. If cleanliness is a deal breaker that's ok. Just make sure the next person has similar habits to yours before moving in.