In no particular order...
1. Perfection doesn't work.
The AI in Matrix have tried it. People can't live in a perfect world. They need challenges. Something to bitch about. Thus instead of driving each other crazy with it... enjoy it. Imperfection is the thing you laugh about in any sit com.
2. Stop keeping score.
You don't have to be a god to forgive and forget. Children do it ALL the time. If sorry has been said, that's the end of it.
3. Eagerly make each other laugh
The thrill and chase might end after "I love you." "I love you too." but that's not the end of it ! It's the beginning ! The happily ever after part. So be competitive and making each other laugh especially now you are together.
4. Be present.
Spend time together even though you're not spending time with each other. Might be a good time to exchange the shit you're having that day too. Sometimes even without interaction... doing each of your own thing in the same place will be magic. Cause you got to stop sometimes and when you do... it's like waking up and have each other beside.
5. Keep busy
Do something you both feel strongly about. Help out in orphanages. Volunteer in youth center. Be active in church or Synagog or BOTH. Patrol the neighborhood with superhero costumes at night...