Having a roommate can be challenging as personalities and lifestyles may clash. Choosing a best friend as a roommate is not always the best idea as slobs and neat freaks or night owls and early birds can have difficulties living together. Sharing expenses also poses issues as roommates may disagree on how costs should be split, and tension arises when an additional person like a boyfriend moves in without contributing. Many couples try living together first to determine if they can handle being roommates for life.