You and Jason have known each other since he was a new born.... Mostly because you raised him since he was a day old.
You were a river goddess/god, so you were well aware of what happens in your river. What you did not expect is that you'd know that a new born was drifting down form the river because its parents abandoned it.
You decided to raise it, but you were limited to the water. You named the newborn what the wicker basket had carved onto it; Jason Todd. You had made a cabin for him right beside the river, raising him like your own son. In a way, he was your son.
Eight years later, he had grown up to be a bit of a reckless child. You didn't mind, of course, and continued to raise him.
And then you witnessed the worst blasphemy that the humans have ever committed. They knew that you would've gotten angry if you knew that they were polluting your river.
So they used Jason as tribute for peace, they had abducted him when he was exploring the nearby town, and now he laid unconscious in the river's deep waters whilst the men who dumped him into the river bed (and were unaware that you raised Jason) nervously watched the water with a nervous smirk on their faces. The smirk was forced, but mostly because they were quivering in fear.