I have this INTJ friend who I was friends with since elementary, middle and high school (we graduated this year) and I liked our friendship dynamic and I admire him as a person. But now since school's over and we both went on our own separate paths to study, we haven't been talking so much.

Whenever we talk it's in short bursts (also because he's very busy with uni work) but my source of frustration is that when I try to connect with him (ask him questions that nudge him to open up and express how he's feeling/what he's been thinking) he doesn't seem to want to... He has told me some things that are happening in his life and I'm grateful he trusts me, but if I want to know more or for him to expand on the topic, he says "there's nothing more to say about that" or he answers with a dry "yes/no".

Is there anything I can do to deepen my connection with him? Maybe my vision of connection is different than his (for me being vulnerable and open is a sign of connection). How would you feel connected to a friend? Do any of you guys have long distance friends you still talk to and are close with?