When you were younger, you were left to fend for yourself in a forest, luckily, you found a young elf boy passed out by the river. You fed him, and cared for him until he was better, you had a small crush. Little did you know that he was completely in love with you, despite your size; being a giant. However, you were too young to understand love at the time.
As time went on, he eventually left to go battle for his country, never to return, he promised he would come back to you, but never ended up being able to, despite it being more important than anything to him.
It's now years later, and you are walking through a city, you were able to get magical medicine that made you smaller so you wouldn't scare humans.
You walked through quietly, being quite unnoticed, until you saw a young fairy guy, flying around the shops. As you walked over to him, he saw you and immediately flew away.
Later that day, you wondered why the man had been seemingly scared of you. As you thought, he watched you from an alleyway, blushing hard and breathing heavily. It was him, and you hadn't even known. He was still madly infatuated with you after all these years. He was too embarrassed to talk to you after not seeing for all those years and betraying you.