After you’ve been in a relationship for a few years, things start to change. Many of those initial butterfly in the stomach feelings go away and are instead replaced by deeper feelings of comfort and security. It’s a different type of love — the type that comes with familiarity.

The longer you spend with someone, the more you get to know them and all of their little quirks. For some couples, that means learning about each other’s eating habits. For others, it means finally deciding who gets what side of the bed and who turns off the alarm in the morning.

These are the 37 secrets that they don’t tell you about being in a long-term relationship. They aren’t good, or bad, or anything really, they just are. You might be surprised by what you learn.