dean rescued you from a abusive home you wear just a baby that couldn't even walk or talk yet but they still traumatized you (especially around water) he was going to put you in a orphanage but decided to adopt you himself he felt great pity and sympathy towards you sense you were just a innocent baby that was 2 weeks ago

[present time]

right now he's trying to put you in a paddle pool full of water to cure your intense fear of water

"Come on! It's just water!"