What does your boyfriend mean when he says you see waves behind you?

Romantic metaphor, encouragement and encouragement.

1, romantic metaphor: spray is often used to symbolize romance, passion and vitality. So "look at the waves behind them" means that their feelings are full of romance and passion, just like the waves.

2. Encourage: My boyfriend wants to encourage courage through this sentence, just like the waves. At the same time, the waves also represent a kind of strength and determination, hoping to be as strong as the waves, not afraid of difficulties, and go forward bravely.