your last sentence may be true...his communication skills may not be as up to snuff as yours. how about limiting what you say and see if he opens up? he may just be a more introverted person and that's ok. i'm a 'chatty cathy" and my husband was more reserved. so i tried to tone it down a bit and it helped. plus you could ask him questions about what he's interested in to make him feel more comfortable talking. and being a good listener helps too. i really had to restrain myself sometimes cause i was so enthusiastic about so many things. my hubby was too, just quieter. you can help create more of a balance in your conversations.
hope this helps.