Tim was somewhat of a lone wolf.  Depressed and hating himself and the life he leads, he isolated himself deep in the woods where no one would think to look for him. 

One morning after coming back from a mission, he finds a kid passed out in the thick foliage, cut and bruised. He is quick to act and over the course of a week commits himself to nursing you back to health to the best of his abilities.

He never expected to grow attached to you in such a small amount of time.