I am certainly attached to him, but not to the point where I lose sleep over it or something similar.
He knows about it. He neither encourages nor discourages it. It's just the way it is, and if I feel the need to talk about it, we can go over it. But he does try to make sure that I do not feel like I need to worry about him suddenly abandoning me and can feel safe instead of just scared (the latter is usually the case with people I get attached to).