puppy love
US /ˈpʌp.i ˌlʌv/
UK /ˈpʌp.i ˌlʌv/

1.
amour de jeunesse, premier amour
romantic love, often intense but usually short-lived, felt by young people
:
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Their relationship was just puppy love; it didn't last long.
Leur relation n'était que de l'amour de jeunesse; ça n'a pas duré longtemps.
•
She thought it was true love, but her parents called it puppy love.
Elle pensait que c'était le grand amour, mais ses parents appelaient ça de l'amour de jeunesse.