Finally got down to this post. Yes, from what you described here (compared to your other post) it does have a lot of the symptoms of Aspergers. There is a very good link here that might help. http://www.webmd.com/brain/brain-disorders-injuries-9/autism
I think the term dull might well describe a person with Aspergers better, until you get to know them anyway.
And it does make a difference in how you relate to them. Unfortunately, unless you can get them to go to a good psychiatrist, it means that you are stuck diagnosing them.
All though they might admit that as a student, they were treated. I would think that the same things that stand out to you, would have done so to teachers.
Whatever, you have said they are a friend. They became a friend without you knowing much about them. It may be they have kind of given up on getting help or never got the help they needed. Either way keep being a friend!
I commented on your other post.