That's a hard go, and more so when you really care about a person. Being a teenager isn't easy by any way, shape or form, so the issues could be boundless. Like most, sometimes we really need to talk. And as strange as it may sound, we need to cry. We need to know that someone is there, are cares. As above, be there for him, discuss things with him. Part of being a good girlfriend, is being a great friend.
just be there for him if he needs space let him have alil