Why do couples in arranged marriages often seem to act like they've been in love forever?

I recently met a friend who got married, and the way they were behaving seemed like they were madly in love—posting tons of photos together, sharing cheesy songs, and just radiating that 'newly-in-love' energy. What’s interesting is that their marriage was arranged, so I couldn’t help but wonder: Why do arranged marriage couples sometimes behave as though they've been in love forever, showing such intense affection and connection so soon?