365 reasons why I love you jar. Both have their own jar and write once a day one thing they love about the other. On their anniversary/birthday/valentine's day/christmas/whatever the occasion, open the jar and read what the other person wrote
Dear JP, my Future Husband who I cherish and adore ❤️ You're my favorite everything, my favorite pair of eyes, my favorite name to see appear on my phone, my favorite way to spend an afternoon . You're my favorite everything.