I'm confused. Maybe there was more information about him before you edited the first post, because I have no idea where people are deriving their typings of him from.
First of all, what are his primary traits? What stands out about him most? Is he outgoing, excitable, quiet, intellectual, reflective, action oriented, theoretical, cold, warm, artistic, private, open?
How does he typically respond when he has to make a decision? Does he make a choice and move forward with it quickly, or does he linger and explore the options?
You said he has a good memory. What sorts of things does he remember? Does he remember experiences and places? Does he remember impressions and atmospheres and feelings?
You said he is not very interested in his career. Why is that? Does he have other goals that he is pursuing, or does he just like to take life as it comes? He clearly is very interested in you!
I find the descriptions on this site useful...
The 16 Type Patterns