My fiance have had major issues in our relationship as of recently and I noticed that he gets annoyed when I start questioning him about his feelings or about what went on or anything. See women are inquisitive and we tend to get closure on situations by asking questions and getting answers to them. Men HATE answering questions, either because they are uncomfortable and don't want to answer the questions or because they just want to relax and not have some deep meaningful conversation all the time. Women communicate differently then they do. Try and just leave him alone for like a week and perhaps when you do come at him the next time with questions, he will be open to answering them.
It's really impossible to say without knowing both of you a lot better. There are so many reasons this could be the case:
He could be under a lot of stress, at work or for some other reason, and just want to chill out at home and not have any serious conversations.
Maybe he feels comfortable with everything in his life the way it is now, and doesn't want to change anything or adapt at all to anything - if that is what you are wanting to talk to him about.
He may feel like you're nagging him. Maybe you are asking him to do something that you consider totally reasonable, but men can be resistant, particularly if you ask him to do the same thing more than once. There are ways of asking someone to do something that don't come across as nagging.
I'm trying not to make any accusations about you or him here - like I say, I just don't know anything about either of you. Yes, men and women DO think differently, the book "Men are from Mars, Women are from Venus" is a great way to get your head around how the other side think and help you to communicate with each other better.
Good luck, I hope you can deal with this issue and achieve a more satisfactory and balanced relationship.