@fluffybun ,
He's the only one that can answer that question accurately. Are you interested in him? Or are you just curious about his behavior?
If you are interested, then while you're in-person (not text) talk with him, engage him and offer your support. Show interest in having broader in-person discussions by taking an active role and direct your conversations to include other topics.
Help these talks to progress to other casual topics beyond school and grief support. Ask him more about his career goals, family, activities, hobbies, music, etc. Why not ask him to have a beverage/coffee/adult beverage? It's not like your asking him on a date. Let him know that you want to get to know him better....as a friend (to start). Help him out as he may not know that you're interested.
Good luck. Let us know how it turns out.