The assumption that a "good" relationship should naturally remain incredibly passionate for 50 years without any effort is a dangerous fairy tale. Passion requires friction, novelty, and intention. If you have slipped into the "roommate" phase, here is how you rebuild the polarity.
1. Introduce Novelty, Not Just Dates
Going to the same Italian restaurant every Friday does not create a spark. Dopamine (the neurotransmitter of desire) is triggered by *novelty*. You must do something you have never down together before. Take a pottery class. Go rock climbing. Navigate a new city. When you overcome a novel challenge together, the brain chemically bonds you.
2. Re-establish Independence
You cannot desire what you already have complete, 24/7 access to. If you are deeply enmeshed, you must create distance to create a spark. Spend a weekend away with friends. Cultivate a hobby they have zero access to. Let them see you shining in an element that does not revolve around them.
3. The 6-Second Kiss Rule
Dr. John Gottman discovered that a kiss lasting 6 seconds acts as a temporary oasis in a busy day. It is long enough to halt the chaotic momentum of the day and release oxytocin. Force yourselves to share one 6-second kiss every single day before leaving the house.