The first time they met, they were destined to be enemies.
When they met again, they were surprised to find that they would still intersect.
So they made each other hate themselves more and more time and time again.
Then start running away from each other all over the world.
Finally, somewhere in his heart was deeply shaken, and then he finally couldn't bear it anymore, finally gave in, and finally admitted that no matter what, she was an indelible shadow in his heart.
Unintentionally, she finally opened her heart to him.
However, none of them revealed it. They think it's just their own wishful thinking and let their feelings fend for themselves.
So, the very brief thought faded away with the years.