I need relationship advice, I really have no idea what to do?

Ok, so my boyfriend has been acting really strange lately, he told me he is depressed because he's been stuck at home from work because of an injury and is missing being away from home. But he didn't really start acting all too strange until one night he asked me what I was thinking and I didn't tell him...which i never do because I'm too embarrassed or scared that it might make him upset. I was actually going to tell him that I was worrying that I was bothering him and stuff but before I could make myself do it he fell asleep so I just forgot about it. When I left his house the next day he seemed fine until that evening which is when he told me he was depressed from work. After that he started talking a bit less and stopped calling me babe or baby which before he had done constantly. He seemed upset at me one night and didn't talk to me again until the middle of the next day and that was only after i sent him a text and he barely talked. That night we actually talked for quite a while so I thought he was fine. But today when I texted him the conversation was very short and he hasn't tried to talk to me at all since. I'm getting depressed now because I think I did something wrong but I'm not sure and I'm afraid to ask him if he is upset at me or if it is only work. Normally he asks me when I have to work so I can come stay with him when I'm not working and he hasn't even mentioned it...well I'm off tomorrow and I'm not sure if I should ask him if he wants me to come visit or if I should just leave things alone until he starts acting normal. What should I do? I really care for him alot and I don't want to mess things up.I need relationship advice, I really have no idea what to do?
ask him what's the problem and be straight to him ;)