[Whether grimacing or smiling very faintly, no one will ever know because he won't do either of them with full disclosure. There's only some reservation with talking about things--the flowers seem ready to blurt out all manner of secrets.

Gently, he finally frowns, and his eye returns to Bolin.]

There was something very important to me I had to do. But... being with them on a team... Naruto, my wife...

They started making me forget about what I thought was most important to me. So I left because they got in the way. I left to accomplish my goal, and I hurt them when I could so they would stay away.