At some point, though, that new relationship shine wears off. You start to take each other for granted. When you feel secure in your relationship, you stop worrying about impressing the other person. As you get to know each other better, you relax and stop being on your best behavior every time you're together. It doesn't seem as important to be solicitous of the other person because you're not trying to captivate each other anymore -- you're already together. Eccentricities and personality quirks also emerge, and you learn that not everything your partner does is cute or funny. Some of it might even be incredibly annoying. You fall into a routine. If you eventually decide to live together or get married, there are even more factors to consider, such as differences in finances, possessions or housekeeping styles.