A young woman and man spending time together indoors.

Marriage is often an exercise in tolerating whatever habits annoy you about your spouse. Still, there are scientific reasons that some pet peeves feel like nails on the chalkboard of intimacy. According to researchers, these are the five habits that annoy spouses the most.
1. The way you chew
2. Looking at your phone
3. Bragging about yourself
4. Spending money irresponsibly
5. Keeping score in the relationship