To bond with your romantic partner more profoundly, make sure you spend quality time together. Communicate with each other freely and frankly, and maintain positive emotional relations. Keep alive your physical connection and learn to give and take in your relationship. Be prepared for ups and downs, but make sure to stay in your partner's shoes for some time. Don't judge; listen, appreciate, be polite and show a certain love. Take fun together and do new things to keep the bond alive.
202 ideas can be found on this page about what to do with your partner, or for a partner to keep your relationship healthy and passionate.
Go to birdwatching.
Go on a cruise around the world.
Grant yourself a full-body massage.
Kiss in the rain.
Play softball together.
I'm not telling you it is going to be easy - I am telling you it is going to be worth it.