It is hard to say. Maybe he does realize the responsability coming, so he is trying to party all that he can now. But that really sucks, because you cannot do that!
Lying is a terrible thing, I would try to put a stop to that. Even little "white" lies make it impossible to trust someone. And it makes getting along hard too, because you are constantly mad.
And suddenly having all of this responsability does suck! But there is nothing you can do about that. Babies are such a blessing, but they are a lot of hard work too. It is a 24/7 job with no pay. And if he isn't helping you get through this, it does make you wonder what will happen when you have the baby. He could get 10 times better, or he could get a lot worse. My only advice is to try to sit down and talk to him and work things out. Explain to him that you do not like it when he goes out, but you are willing to negotiate. I mean, you cannot go to the bars and stuff when you are pregnant, but there is no reason you cannot go shopping (even just window shopping), or to a movie or out for coffee with a friend. And when you two have the baby you have to continue compromising. This will help you two a lot in the long run.
But on the other hand if he does not want to stay it is not doing either of you any good having him there. I absolutely cannot stand people staying together just for the kids, because it just makes life miserable for everyone involved. So, as hard as it will be, give him the option. Tell him he is either with you 100% or he is not there at all. I mean, he can be there for the baby, but you two just not be together. Yeah that is a horrible thing to think about, but it is the right decision.
Well, even having said everything above, really all you can do is just flat out ask him what is on his mind. Do not make any harsh or sudden decisions, but do not try to kid yourself either. Good luck!
