Love decreases a person's likelihood of being depressed
Being in love is proven to decrease a person's likelihood of being depressed. A recent study found that subjects who were recently married scored an average of 3.42 points lower on the 84-point depression scale than unmarried subjects [Journal of Health and Social Behavior].
Simply living with your significant other can also reduce your risk of mental health issues. A 2005 study of middle aged women discovered that living with a significant other reduces the risk of psychological problems just as much as walking down the aisle.