Baby #2 but first for my bf

I need advise. My boyfriend of 4 years and I have been trying for a baby for some time. I am finally pregnant and he is acting very odd. He said he was excited and happy but didn’t have much of a reaction. A week later he is spending more time at work and with friends. He went to stay with his brother for a few days on my suggestion but he took ALL his clothes, including his tv. I first thought he was just nervous and stressed but now I’m not so sure. I’m am doing my best not to stress about it and just give him some space but I’m lost. What’s going on?