Falling in love was like drowning. It started with a deep breath and ended with no way out.
Scotty had always been afraid of drowning, and perhaps, that was exactly the reason why he was so afraid of falling in love.
Pavel had never been afraid of drowning, nor afraid of water. He was born out of it after all. And one day, he would become it again. It was his past and his future.
There was absolutely no reason for them to be together. No logical reason at least. But lets get real here, most fairy tales are quite illogical. And those always have a happy ending.