We all have a "love bank" and those we know have accounts in it. When people do things that make us feel good, "love units" are deposited. And when they do things that make us feel bad, love units are withdrawn. We are emotionally attracted to people with large balances in the "love bank" accounts, and we are repulsed by those with negative balances. We call those feelings, respectively, love and hate.
How can a couple keep their "love bank" balances high enough to experience romantic love? Couples deposit love units by meeting each other's most important emotional needs. Couples withdraw love units by demonstrating habits that cause the other to be unhappy.