perfect example of Lucas completely failing to understand love due to his narcissism. For healthy people, romantic love is built on trust. There are no guarantees or transactions. Needing proof is tantamount to buying affection. What Lucas wants is adoration, which is exactly the showing of evidence of affinity. But adoration isn’t love. And it isn’t healthy. Real love allows two people to accept each other while challenging each other. It isn’t proving complete acceptance and forbidding any criticism.
Lucas doesn’t know this though. He has never really been loved by anyone in a healthy way—primarily due to his own unlovable traits. It’s sad.