Most Helpful Guy
Well good thing you're both Scorpios, or else the whole thing would be completely screwed. You guys should both thank your parents for having sex roughly the same time of the year.
Anyways... That actually seems like a fairly healthy relationship. He is very busy. He is also a grown man with his own life. So he's going to make time for himself and his friends as well as make time for you. He seems like he cares.
Now onto the cautions. Be very careful about treating this as one of those 'love of your life omg going to get married and have ALL THE BABIES!' situations. Play it casually and try not to get too invested into the relationship. If he wants to take things further, and you do too, that's fine. But be aware that this may not happen soon.
Once we hit around 25 or so, we realize the importance of actually sitting down and talking about the status of our relationship(some younger some later, please don't blast me in the comments going I KNEW THAT WHEN I WAS 4! I don't care, and this isn't about you). If he hasn't said he's exclusive, don't just assume him to be. He shouldn't assume the same of you either.
TLDR: You sound like you have a very healthy but very casual relationship. You should sit down with him at some point to figure out expectations and where the relationship stands.