My boyfriend is going through a lot...

Okay so lately (past couple of months) my boyfriend seems to be kind of depressed. It has gotten better but for a little while it put some problems in our relationship. Until one day (stupidly) I snapped and told him that he needed to stop taking his problems out on me. Because he has a tendency when he's really stressed to act like a total dick (he is really great though, and he treats me well). And he was just being short with me for a couple of weeks before that. But then after I snapped he totally flipped and things just started to get better. But he is still not like cured or anything. He is still stressed and tired all the time. Both of us are full time high school students. He also had a job and his manager schedules him for like every day of the week that he doesn't have robotics after school or a weakened competition. And he says that not being able to see me makes it all worse. And I just feel bad because there's nothing I can do about it. But if anyone has tips I would really appreciate them, I really just needed to rant.