Its about whats coming, you need to talk to him, he may be having feelings, that most men wont show, that may need to get out in the open. Even though youre giving up for adoption, the realization that he is bringing a child into this world is most likely bringing up emotions he has never had before, and he doesnt know what to think. he is most likely scared he may be making the wrong decision. Give him a little room to mull it over and figure it out, but tell him he needs to talk to you soon, so you can clear the air and figure out whats the problem, and that you need his support to get through it. While you are the one most affected in every aspect by this event, he is being affected as well, dont forget that it has to be a give and take thing. But then again i dont know the specifics of how long this has been going on.