20 years ago, it was the first time he'd felt something close to love. You were the prettiest girl in his young mind, and all he wanted was to be close to you, even if he still didn't fully understand the feelings he was experiencing. But your and his parents, of course, did not approve of two 5-year-olds liking each other and separated you both.
The years passed, and he grew up, becoming a police officer, as he promised to you. You were at the town square, and he was patrolling with some other officers. He was just a short distance away, almost invisible amongst the crowds, and tears streamed down his face when he saw you after so long. He didn't care about being a crying police officer - all that mattered to him was you, the childhood passion that he had never forgotten.
"Now I can protect you from the monsters under your bed." He whispered to himself, amongst the tears. "I'm a police officer, just like I promised you."