Be proactive about warding off threats to your relationship. Avoid lots of time apart, or unwise behavior such as hanging out with people you used to be on/off with.

You can’t guarantee fidelity, but you can do your best to make the relationship the container that you each value so highly, that going elsewhere isn’t desirable.

Never stop romancing them. This’ll let them know for sure you’re still crazy about them.

Also still kiss them hello and goodbye. Small gestures like this help us all to experience love from our partners.

In close relationships, people are bound to occasionally say thoughtless things, or neglect you somehow. But unless it has seriously upset you, forgive them right away.

Not harboring grievances is a key way we protect our relationships from internal threats. Couples that stay in love forgive each other for minor grievances.

When you listen, even on seemingly insignificant discussions, you understand your partner better and it shows you continue to give them the same attention you gave them in the beginning. 

Unless you are together all the time, never stop asking them how their day went. Nobody else cares enough to ask them consistently.

Couples naturally become more complacent in pleasing each other as the relationship progresses.

Notice what you do that your partner seems to really respond to. Love is subjective, we show and receive it differently, so you need to know how to love them in their language and not neglect that.