12. Not Cleaning Up After Yourself
Some people had the bad habit of not cleaning up themselves when living with a partner. Indeed, this is a very immature behavior, but some people were brought up in this way. Their parents may have allowed them to keep messing around and don't let them do their chores. Some of them can go their entire lives even when they get married or divorced. In most cases, you will end up with a pile of trash as they never learn how to clean up properly.
If this sounds like you, we aren't making you feel bad. Your parents didn't teach you how to do your laundry or cleanup. It's not right for you. However, you need to realize if you are doing this early. It may ruin your relationship with your partner. They are not your maid. Every adult should be responsible for taking care of themselves. It is good for your health as well as for everyone around you.