Most Helpful Guy
According to Prof: You should not wait for him to ask you, you know you should totally tell him of you wanna hang out with him, there are a very few people who loves someone company and maybe someday he will ask you out.
Most Helpful Girl
No, it's not. If you like spending time with him, just go for it! But try not being overbearing. You said yourself: you guys both have a very busy schedule, so it's understandable that he'd refuse. Just tell him that you like spending time with him, that you value these times you hang out together.