The main thing in a romantic relationship is communication. You should never be afraid to ask your partner something. The only thing you need concern yourself about is how you ask. He's your boyfriend, you should be able to tell if he's feeling down or angry. Use your knowledge to find the best way to ask him what's going on, and be open to what he has to say.
Well, if I was in your boyfriend's place I would want you to come talk to me and confront me about what's going on. Maybe I'm having a hard time at school, work, home, and stuff like that. You do have a right to know what's going on.
I agree that in order to have a good relationship you have to have communication. Ask him about it and see what he does when you ask about it... even if he doesn't tell you what it is exactly, his body language could always give you a clue.
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